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Consumer Products => Avast Free Antivirus / Premium Security (legacy Pro Antivirus, Internet Security, Premier) => Topic started by: ConjureLass on April 25, 2011, 11:54:40 PM

Title: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: ConjureLass on April 25, 2011, 11:54:40 PM
I'm almost 100% certain that this is a problem with Avast.  I never had this issue before I updated it a week ago.  Now, sometimes when I start the computer it gives me the "An unauthorized change was made to your license" error.  If I reboot, the problem goes away and the system starts normally.  I also get the popup window when I simply leave the computer on doing absolutely NOTHING.  What's going on?  Is anyone else having this issue?  The computer doesn't do it all the time.  But I don't want it to get any worse!

Any help would be appreciated. 
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: Lisandro on April 26, 2011, 12:55:59 AM
Which is your Windows version?
Did you try uninstall, boot, install avast again, boot?
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: ConjureLass on April 26, 2011, 01:11:48 AM
I run windows Vista.  And I haven't uninstalled it yet, but I was thinking about trying that next.  Is there any way to find out what it might be interfering with?  Some sort of scan I can do?
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: Lisandro on April 26, 2011, 01:14:32 AM
Hmmm... I don't think it has anything to do with infection.
Which was your antivirus before avast?
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: Nesivos on April 26, 2011, 02:10:46 AM
I'm almost 100% certain that this is a problem with Avast.  I never had this issue before I updated it a week ago.  Now, sometimes when I start the computer it gives me the "An unauthorized change was made to your license" error.  If I reboot, the problem goes away and the system starts normally.  I also get the popup window when I simply leave the computer on doing absolutely NOTHING.  What's going on?  Is anyone else having this issue?  The computer doesn't do it all the time.  But I don't want it to get any worse!

Any help would be appreciated. 

You didn't say but do you know based upon the error message whether it refers to Avast or Windows?

Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: Lisandro on April 26, 2011, 02:39:13 AM
Well... In my answers I always suppose you're referring to Windows... Am I wrong?
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: ConjureLass on April 26, 2011, 02:52:18 AM
It's definitely a windows error, not avast.  My suspicion that it stems from avast is mostly based on the fact that it never, ever did this before I updated the program last week.

Before I had avast I had norton, which was just so awful I deleted it and never looked back.  Is it possible there is some lingering files that are messing with avast?
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: Lisandro on April 26, 2011, 02:56:55 AM
Is it possible there is some lingering files that are messing with avast?
The Norton Removal Tool uninstalls all Norton 2003-2010 products from your computer.

1) (If possible) Remove Symantec products through Add/Remove programs from Control Panel. Boot.
2) Use Norton Removal Tool for Windows 2000/XP/Vista/7 (http://fileforum.betanews.com/detail/Norton_Removal_Tool_for_Windows_2000XPVista/1169144666/1) or Norton Removal Tool for Windows 98/Me (http://fileforum.betanews.com/detail/Norton_Removal_Tool_for_Windows_98Me/1169144666/2). Boot.
3) Install avast! (or repair the installation) and boot.

Norton is very difficult to get rid of :P
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: safacto on April 28, 2011, 12:12:44 PM
Just wanted to say I had the same problem on Vista x64. The latest Avast update seemed to change some security file in windows, giving me the "unauthorized change to windows" message which prompts you to re-validate windows. Unfortunately the windows validation website is broken and just continually redirects to a bing search page. No other windows functions except default web browser are available until after validation.

In safe mode I tried rolling back to an earlier restore point, and this initially worked, but after restarting a second time, the error comes back. Seems that Avast might be re-updating itself or something?

Uninstalling Avast got rid of the error. Think I might wait till the next Avast update before I try installing again...

Did full system scan (8 hours!!) with Microsoft Security Essentials afterwards and no malware or anything found.

Cheers,
Richard.

P.S. Had Avast installed for over a year before this with no probs, but this latest update just borked it.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: Lisandro on April 28, 2011, 01:33:41 PM
safacto, I suggest an installation from scratch:

1. Download the latest version of avast! Uninstall Utility (http://www.avast.com/eng/avast-uninstall-utility.html) and save it.
2. Download the latest avast! (http://www.avast.com/eng/programs.html) version and save it.
3. Uninstall avast from Control Panel (if possible). If, for any reason, you can't run it, try booting in Safe Mode (http://www.pchell.com/support/safemode.shtml) and doing it from there. Anyway, boot after that.
4. Run the avast! Uninstall Utility saved on 1. If, for any reason, you can't run it, try booting in Safe Mode (http://www.pchell.com/support/safemode.shtml) and doing it from there. Anyway, boot after you've run it.
5. Install avast! using the setup saved on 2. Boot.
6. Register your free copy or add the license key for Pro. Or even upgrade (http://www.avast.com/resend-license-paid.php) your key from old versions.
7. Check and post the results. If, for any reason, you did not solve, try doing the step 3 in Safe Mode anyway.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: logos on April 28, 2011, 01:52:47 PM
use Windows Activation Technology KB file to repair the activation process
http://support.microsoft.com/kb/971033

(that's W7 version, google for Vista)
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: logos on April 28, 2011, 01:54:27 PM
safacto, I suggest an installation from scratch:

... that's already what he said he would do ::) (he has uninstalled Avast for now)
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: cstro on May 01, 2011, 06:07:50 PM
Had the same problem. Did a restore to a previous restore point so the Avast program was set back to 5.1 and I have stayed with that until a newer version of 6.0 comes out.

I have used Avast free from day one on this computer for more than 2 years, first time the update has caused this problem.

Windows Vista Home Premium 64bit.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: nokomis on May 02, 2011, 02:33:34 AM
I'm getting this same thing. I never had Norton, only the free version of Avast. In the past week,whenever I boot up my PC, right after the Vista welcome screen, the screen goes dark showing a box that says "An unauthorized change has been made to Windows" and I can't access my desktop or any files. Restarting my PC will stop it, but it keeps recurring. No new software or changes have been made to my PC other than Avast's updates, so I'm starting to suspect it could be something to do with Avast.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: Maskulo on May 02, 2011, 05:06:24 PM
Same problem here :(

Last night I (properly) unistalled Avira, re-booted and finally installed Avast free. This morning I can't access Windows: after writing my password at startup, I get the "Unauthorized Windows Change" message and I'm redirected to a Microsoft web page that fails to load.

System info: Windows Vista Ultimate 64-bit; Avast 6.0.1091 (virus defs 110502-0); virus free.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: nokomis on May 02, 2011, 08:17:12 PM
Here is a screen shot of the message that now displays now and then:
Going to the links it gives doesn't really take me anywhere and I ran a Genuine Windows diagnostic and it shows my version is genuine (came with my Dell Inspiron 530). I wonder if there's a bug in one of the recent Avast updates that could be causing this problem.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: farawayjay on May 22, 2011, 07:02:12 AM
OK, I was having this same problem after the last Avast update -- suddenly, Vista got validation errors. This is a Vista copy without Support pack 2 installed.

Microsoft said this was definitely Avast's problem, and to uninstall Avast:

http://social.microsoft.com/Forums/en-US/genuinevista/thread/e2f066b3-2517-41bc-8fad-4c036f2f4ac8

I did so, and the validation errors ended. Something in Avast's update triggers the messages.

The Microsoft post says that Avast is "in denial" on this issue and "does not appear to be doing anything about it." I hope that by sharing my experience, Avast can get this issue resolved.



Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: Tarq57 on May 22, 2011, 07:35:24 AM
I wonder how many of the users experiencing this issue are not using SP2 with Vista.
That would appear to be something to try.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: nokomis on May 22, 2011, 07:41:39 PM
I know I'm not using SP 2 and after a couple of weeks of not getting the error, it came back today.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: mayday99 on May 24, 2011, 02:08:22 AM
Another one. Vista x64 Ultimate. Avast upgraded itself from 5.1.889. If I do I system restore to before the upgrade everything is OK. Once it upgrades itself problem is back. Nothing else was changed on the PC. BTW, those of you saying you stayed on an older version, how did you do that ? My update settings are "ask first", but Avast does the upgrade without asking, and THEN tells me. Did you switch to manual ?
I have the default installations of the free versions of Anti-Malware and Superantyspyware, and no, I am not uninstalling them.
Anyway, I switched to another product (for now), no time for playing games.

While I am not a big proponent of MS, and have been a user of Avast for a long time, I have to agree with MS on this. All I see here is ;we don't know what is happening, but we know for sure it is not us. It is everybody else. "Uninstall all other programs, reboot your PC, reinstall Avast, jiggle your cables, and wiggle your ears".

How about Avast doing something about it ?

Isn't it time for Avast to take this seriously, instead of loosing the trust of users earned over the years ?
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: Tarq57 on May 24, 2011, 02:25:42 AM
mayday99, what service pack is installed on your OS?
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: wonderwrench on May 24, 2011, 05:46:36 PM
Yes something is up for sure. Last weekend I was at a friends house and since I maintain his PC's I noticed his Windows 7 64 bit sp1 laptop was still running Avast 5.1 Free. I updated it to 6.0.1125 though the GUI. Once complete I rebooted the PC and received the "Unauthorized Windows Change" error. I had limited time but did try to reactivate windows but it was a no go. I attempted a system restore but it failed. I hope to get back to it this weekend. Hope to god I do not need to reload the OS. This really needs fixing ASAP!

Bill   
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: nokomis on May 25, 2011, 01:47:33 AM
When that "unauthorized change to windows" error first started showing, and after lots of troubleshooting, I too did a system restore and the problem persists. I wish Avast would get to the bottom of this and soon!
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: Tarq57 on May 25, 2011, 02:12:24 AM
What have you got against updating the service pack on Vista, nokomis?

(If you did this, I'd be inclined to download the service pack, or both service packs, the Avast uninstall utility, the Avast installation file, and save them, then go offline, remove Avast, install each service pack, rebooting in between, then install Avast again and go back online. That's how I'd proceed, anyway.)
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: nokomis on May 25, 2011, 02:14:57 AM
Been there, done that.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: Tarq57 on May 25, 2011, 03:52:02 AM
So you have SP2 installed? One of your posts above states the opposite.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: nokomis on May 25, 2011, 04:06:45 AM
Yes, I have SP 2 installed.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: SafeSurf on May 25, 2011, 06:30:02 AM
@ nokomis,

Do you have genuine Windows installed on your machine?
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: farawayjay on May 25, 2011, 07:04:19 AM
I should note that in my case, I never could complete a successful update to SP2 while the Validation issue was ongoing. It limited the functionality somehow, and the update never took. Once Avast was removed, the Validation problem ended and the SP2 install worked.

I am reluctant to reload Avast until I hear authoritatively that it is a Vista-without-SP2 problem only.

(And yes, my copy was genuine -- came with the computer.)
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: SafeSurf on May 25, 2011, 07:30:12 AM
I have sent a message to the Avast Team to see if  they are aware of the issue and to look at this thread.  Thank you.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: urlnts on May 25, 2011, 03:45:21 PM
I also keep getting this same message,if I turn off auto updates for virus definitions it stops!I have a problem with my Dell Laptop,Media Direct  and Windows,SO I cannot update to Vista Sp2!!!Why can't you just allow for virus definition   updates to be done manually without all of the cautions or come back with a fix,this is a fairly new problem?
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: nokomis on May 26, 2011, 01:58:01 AM
Yes, SafeSurf, I ran a check on my Windows and it is Genuine (came installed on my Dell Inspiron 530 desktop in 2008)
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: SafeSurf on May 26, 2011, 10:05:29 AM
<snip> Why can't you just allow for virus definition   updates to be done manually without all of the cautions or come back with a fix,this is a fairly new problem?
I am not employed by Avast; I am a volunteer and user just like you.  However MS has acknowledged that Vista with <SP2 can have problems, therefore we are recommending that you update to SP2.

@ urlnts,

I suggest you submit a mini-dump file to Avast:

Here is additional information on how to invoke a memory dump file:  http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=71 (http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=71).

Please, zip and upload the C:\Windows\Memory.dmp file to this anonymous ftp server and name it uniquely giving us the name of the file in this thread: ftp.avast.com/incoming (http://ftp.avast.com/incoming).  Avast will analyze it and respond back to you in this thread.

If having difficulty with dump file:

-   Using Internet Explorer, Connect to the link and drag the file into the Right pane and drop it, that starts the upload, you don't have read access to this folder, so you won't be able to see it once uploaded.
Or
-   Upload it using the Run command-line in Windows: Windows Key + R (to get the run box), copy and paste this:
Code:
explorer ftp://ftp.avast.com/incoming
     and drag the file into the window, from another explorer window.

@ nokomis,

Thank you for your [kind] reply.   You can also, if you like, submit a mini-dump if you like, however please see my quote below.  Since there are other users with the same issue, Avast will need to look into this matter.  Thank you.

I have sent a message to the Avast Team to see if  they are aware of the issue and to look at this thread.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: rmambour on June 15, 2011, 08:10:12 AM
I have the same problem since a week, after installation of free avast, I suppose last version..
Vista 32bits was running fine since 3 Years, with GData anti-virus.
Last night I removed AVast and rinstall GData, and this moring no problem anymore...
I checked and found no virus...So I suppose that the probklem was AVAST...
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: MuuGi on June 15, 2011, 12:54:21 PM
I got the same error, stating that my windows is not registered and I should validate it again, when I updated my Avast 5 to new 6.0.1125 on my Windows 7 64bit. After I got that error, I booted my computer and haven't got this problem anymore after that.
Strange one indeed.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: frickaline on June 27, 2011, 10:27:11 PM
I have this issue as well and I found this on Microsoft's site:

http://social.microsoft.com/Forums/en-US/genuinevista/thread/E2F066B3-2517-41BC-8FAD-4C036F2F4AC8

Quote
The only known solution currently is to uninstall Avast! completely, and run their removal tool as well, then validate the system again, and install an alternative (free or paid-for) Anti-Virus solution.
Note that the majority of cases appear to be in systems where Vista has not been updated to Service Pack 2 - which may or may not have anything to do with the problem, but should be rectified by the user as soon as possible.
 
Avast! appear to be in denial about the situation - and do not appear to be doing anything about it.

 :-\

C'mon guys, what gives?
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: joffenb on July 01, 2011, 02:24:32 AM
Trying to troubleshoot a laptop for a friend, and ended up cloning the HD and doing a recovery from the recover partition.  Put freshly downloaded copy of AVAST free on and when Vista Home Premium x64 did it's updates, they failed, and then the system gave the "Unauthorized Windows Change" (UWC) error limiting me to only a browser.  In an effort to eliminate hardware, I downloaded a fresh copy of Vista Home Premium x64 from Technet, reformatted, and installed.  With AVAST Free installed, same thing.  Rebooted in safe mode, removed avast, system booted normally.  Version of Vista was with SP1 and latest try died while trying to install 111 updates (failed then gave me the UWC error.  Definitely looks like something AVAST has done in the last week or so is causing a problem with Vista.  Research on Microsoft's forums confirmed it as a problem and stated that AVAST "could not duplicate the problem"...  AVAST - try the above scenario and you should be able to produce the problem...  The situation doesn't seem to affect XP or Windows 7 machines that I have seen or heard of.

p.s.  Did not have to revalidate - System just came up validated after removing AVAST in safe mode...
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: plebby on July 05, 2011, 04:55:31 AM
As far as I'm concerened it is Avast that is causing the problem so no point burying ones head in the sand and hoping it will go away. I never had this problem until I installed the new version of Avast (free) but ever since I got the unauthorised change warning, a reboot sometimes two or three times, did help it but even when surfing the internet the warning would pop up. I also found that it locked me out of my control panel and started interfering with my connection to the internet. I have since moved on and uninstalled Avast, using another brand free antivirus programme and guess what?. After a month I've never had the problem again. Speaks volumes.
Title: Re: Updated Avast, now I get a "Unauthorized Windows Change" error
Post by: Vladimyr on July 05, 2011, 05:23:15 AM
As far as I'm concerened it is Avast that is causing the problem so no point burying ones head in the sand and hoping it will go away. I never had this problem until I installed the new version of Avast (free) but ever since I got the unauthorised change warning, a reboot sometimes two or three times, did help it but even when surfing the internet the warning would pop up. I also found that it locked me out of my control panel and started interfering with my connection to the internet. I have since moved on and uninstalled Avast, using another brand free antivirus programme and guess what?. After a month I've never had the problem again. Speaks volumes.

I haven't seen it myself but this problem happens with non-updated Vista and avast! 6.
Latest release http://forum.avast.com/index.php?topic=81028.0 is supposed to have fixed it.