Avast WEBforum

Consumer Products => Avast Free Antivirus / Premium Security (legacy Pro Antivirus, Internet Security, Premier) => Topic started by: REDACTED on March 06, 2017, 10:47:33 PM

Title: Avast blocking applications
Post by: REDACTED on March 06, 2017, 10:47:33 PM

Since downloading the latest version (3-5-2017), I cannot open cleanmgr (Error 0xc0000005), Task Manager, and even Sketchup.  At boot-up I get a black screen, which can only be resolved with a restart (Task Manager can't be accessed). I tried uninstalling and re-installing (using Avast Clear in safe mode), but the same problems persist. When I disable the Avast shields, all the programs load perfectly.

Windows 8.1.

How can I solve this?

Title: Re: Avast blocking applications
Post by: Eddy on March 06, 2017, 10:59:34 PM

Disable the behavior shield and see if it solves the problem.

Title: Re: Avast blocking applications
Post by: REDACTED on March 07, 2017, 12:43:57 AM

Is this dangerous?

Also, now Avast is blocking Firefox as not a secure site!

Title: Re: Avast blocking applications
Post by: Eddy on March 07, 2017, 12:45:40 AM

That can't be as FireFox is a browser, not a site.
Please attach a screenshot of the message to your next post.

Title: Re: Avast blocking applications
Post by: REDACTED on March 07, 2017, 12:50:07 AM

You know what I mean.

Or in case you don't: Error code: SEC_ERROR_UNKNOWN_ISSUER


Behavior shield is unchecked. Checked are: File System, Mail, and Web.