Author Topic: Windows Defender scans reported whilst running Avast  (Read 724 times)

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Offline rocksteady

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Windows Defender scans reported whilst running Avast
« on: August 31, 2019, 10:20:12 AM »
I had a surprising Notification flag this morning (win10 1903) stating that Windows Defender had found no problems from 3 scans. Afraid did not think to take a screenshot.
I thought Windows Defender was set dormant when Avast is installed and running?
Could Avast drop down to Defender in event of an Avast update. Looks like some Avast Secure Browser update has occured.
Using Avast free 19.7.2388 (build 19.7.4674.524)
« Last Edit: August 31, 2019, 10:30:55 AM by rocksteady »

Offline Asyn

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Re: Windows Defender scans reported whilst running Avast
« Reply #1 on: August 31, 2019, 11:04:03 AM »
I thought Windows Defender was set dormant when Avast is installed and running?
The resident parts, yes. You can still run on demand scans, though.
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Offline rocksteady

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Re: Windows Defender scans reported whilst running Avast
« Reply #2 on: August 31, 2019, 08:24:09 PM »
I never run demand scan with Defender. So was not the result of that.

Offline DavidR

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Re: Windows Defender scans reported whilst running Avast
« Reply #3 on: August 31, 2019, 08:46:25 PM »
I never run demand scan with Defender. So was not the result of that.

If memory serves me right I think I saw a setting that it would run a WD scheduled scan at some time frame, I'm fairly sure I changed this not to.

So you may not have set it to scan if the above is correct.
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Offline rocksteady

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Re: Windows Defender scans reported whilst running Avast
« Reply #4 on: September 17, 2019, 07:05:00 PM »
I had a surprising Notification flag this morning (win10 1903) stating that Windows Defender had found no problems from 3 scans. Afraid did not think to take a screenshot.
I thought Windows Defender was set dormant when Avast is installed and running?
Could Avast drop down to Defender in event of an Avast update. Looks like some Avast Secure Browser update has occured.
Using Avast free 19.7.2388 (build 19.7.4674.524)

Had another instance of this Notification of Defender scans whilst running Avast Free. See attached.

Also had to do a Restart requested by Avast UI today. No reason given and I cannot see change to build version. I have 19.7.2388 (build 19.7.4674.531).

Offline schmidthouse

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Re: Windows Defender scans reported whilst running Avast
« Reply #5 on: September 17, 2019, 07:58:59 PM »
I never run demand scan with Defender. So was not the result of that.

If memory serves me right I think I saw a setting that it would run a WD scheduled scan at some time frame, I'm fairly sure I changed this not to.

So you may not have set it to scan if the above is correct.

The setting that I see which gives a choice of periodic scans on my system is set to OFF.
I have never seen any notification :)

See Attachment
***HP ENVY 15K LT W10 Pro 1903 64Bit/750GB HD/16GB Ram/Avast Premier 19.8.2393 /VS 5.02(WC)/ASB/Mbam 4/Secureline b. 5.5/SANDBOXIE/Prey Project
**HP Compaq 8510p LT W10 Pro 1903 64Bit/1TB HD/8GB Ram/Avast Premier BETA 19.9.2394 /VS 5.02(WC)/ASB beta/Secureline b 5.5/SANDBOXIE/Prey Project 
     
*Dell Inspiron XPsp4 PRO 32Bit/Avast(since 2002)18.8.2356/OSA/WP/Comodo FW 3.14/Secureline/Comodo IceDragon v.40
<LAYERED SECURITY SOFTWARE PROTECTION ALL>

Offline DavidR

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Re: Windows Defender scans reported whilst running Avast
« Reply #6 on: September 17, 2019, 08:06:10 PM »
I never run demand scan with Defender. So was not the result of that.

If memory serves me right I think I saw a setting that it would run a WD scheduled scan at some time frame, I'm fairly sure I changed this not to.

So you may not have set it to scan if the above is correct.

The setting that I see which gives a choice of periodic scans on my system is set to OFF.
I have never seen any notification :)

See Attachment

That is certainly familiar and I disabled that shortly after I got my win10 system.

Looks like 'rocksteady' needs to ensure that setting is off.
WinXP ProSP3/ Core2Duo E8300/ 4GB Ram/ avast! free 18.5.2342/ Firefox ESR, uBlock Origin, uMatrix/ MailWasher Pro7.11.0/ DropMyRights/ WinPatrol+/ Drive Image 7.1/ SnagIt 10.0/ avast! mobile security
Windows 10 Home 64bit/ Acer Aspire F15/ Intel Core i5 7200U 2.5GHz, 8GB DDR4 memory, 256GB SSD, 1TB HDD/ avast! free 19.8.2393 (build 19.8.4793.541) UI-1.0.415/ WinPatrol+/ Firefox, uBlock Origin, uMatrix/ MailWasher Pro7.11.0/ WinPatrol+/

Offline rocksteady

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Re: Windows Defender scans reported whilst running Avast
« Reply #7 on: September 18, 2019, 03:29:54 PM »
I have just found the setting you mention, but I will probably leave it ON as should do no harm now that I know it is not an error.
Nevertheless, I would also be interested in anyones opinion and experience whether this setting should be left ON (seems default) or switched OFF.
« Last Edit: September 18, 2019, 03:33:07 PM by rocksteady »

Offline Asyn

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Re: Windows Defender scans reported whilst running Avast
« Reply #8 on: September 18, 2019, 03:48:26 PM »
Nevertheless, I would also be interested in anyones opinion and experience whether this setting should be left ON (seems default) or switched OFF.
IMO, you can safely disable it with Avast installed.
Win 8.1 [x64] - Avast PremSec 19.9.2394.B1 - CC 5.63 - EEK - Firefox ESR 68.2 [NS/AOS/uBO] - Thunderbird 68.2.2 [EM] - ACP/ASL.BC
Deutschsprachiger Bereich -> Avast Wissenswertes (Downloads, Anleitungen & Infos): https://forum.avast.com/index.php?topic=60523.0

Offline DavidR

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Re: Windows Defender scans reported whilst running Avast
« Reply #9 on: September 18, 2019, 05:57:00 PM »
Nevertheless, I would also be interested in anyones opinion and experience whether this setting should be left ON (seems default) or switched OFF.
IMO, you can safely disable it with Avast installed.

I too would also disable it, as there might well be an overhead, any virus database would have to be updated regularly (at least before a scheduled scan), by Defender, so there is that consideration.
WinXP ProSP3/ Core2Duo E8300/ 4GB Ram/ avast! free 18.5.2342/ Firefox ESR, uBlock Origin, uMatrix/ MailWasher Pro7.11.0/ DropMyRights/ WinPatrol+/ Drive Image 7.1/ SnagIt 10.0/ avast! mobile security
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Offline schmidthouse

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Re: Windows Defender scans reported whilst running Avast
« Reply #10 on: September 18, 2019, 06:04:24 PM »
Nevertheless, I would also be interested in anyones opinion and experience whether this setting should be left ON (seems default) or switched OFF.
IMO, you can safely disable it with Avast installed.

I too would also disable it, as there might well be an overhead, any virus database would have to be updated regularly (at least before a scheduled scan), by Defender, so there is that consideration.

+1 Yup
***HP ENVY 15K LT W10 Pro 1903 64Bit/750GB HD/16GB Ram/Avast Premier 19.8.2393 /VS 5.02(WC)/ASB/Mbam 4/Secureline b. 5.5/SANDBOXIE/Prey Project
**HP Compaq 8510p LT W10 Pro 1903 64Bit/1TB HD/8GB Ram/Avast Premier BETA 19.9.2394 /VS 5.02(WC)/ASB beta/Secureline b 5.5/SANDBOXIE/Prey Project 
     
*Dell Inspiron XPsp4 PRO 32Bit/Avast(since 2002)18.8.2356/OSA/WP/Comodo FW 3.14/Secureline/Comodo IceDragon v.40
<LAYERED SECURITY SOFTWARE PROTECTION ALL>

Offline rocksteady

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Re: Windows Defender scans reported whilst running Avast
« Reply #11 on: September 18, 2019, 06:08:42 PM »
Thanks, I accept that advice.
Nothing is ever straightforward with Windows. I turned the slider switch OFF, but then immediately witnessed a notification that periodic scans had been turned ON!  ???
Did a Restart for good measure.
Went into Windows Security again and found the UI now a bit different Opened "Windows Defender Antivirus Options", found the  periodic scan switch again showing as ON, so switched it OFF again (screenshot). No switch state notification this time round.

Edit: If you look at my earlier screenshot (reply #7) it was OFF in the first place. When you slide to off it actually changes to ON. So explains my rant above. So from OFF I have turned it ON then back OFF. So why was Defender doing periodic scans in the first place me thinks. I will see what happens in future days.

« Last Edit: September 18, 2019, 06:16:51 PM by rocksteady »

Offline DavidR

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Re: Windows Defender scans reported whilst running Avast
« Reply #12 on: September 18, 2019, 08:17:56 PM »
Thanks, I accept that advice.
<snip>
Edit: If you look at my earlier screenshot (reply #7) it was OFF in the first place. When you slide to off it actually changes to ON. So explains my rant above. So from OFF I have turned it ON then back OFF. So why was Defender doing periodic scans in the first place me thinks. I will see what happens in future days.

You're welcome.

There are many settings in win10 from early on that were a pain in the backside for many users. 

The defender periodic scans one you stumbled into was just one of these pain in the backside default options.  I feel that too should be disabled when you install a 3rd party AV program, not just disabling defender real-time scanning.
WinXP ProSP3/ Core2Duo E8300/ 4GB Ram/ avast! free 18.5.2342/ Firefox ESR, uBlock Origin, uMatrix/ MailWasher Pro7.11.0/ DropMyRights/ WinPatrol+/ Drive Image 7.1/ SnagIt 10.0/ avast! mobile security
Windows 10 Home 64bit/ Acer Aspire F15/ Intel Core i5 7200U 2.5GHz, 8GB DDR4 memory, 256GB SSD, 1TB HDD/ avast! free 19.8.2393 (build 19.8.4793.541) UI-1.0.415/ WinPatrol+/ Firefox, uBlock Origin, uMatrix/ MailWasher Pro7.11.0/ WinPatrol+/