Are you sure no programs in the background are updating? Such as Windows Update? Does the issue occur WITHOUT Avast installed?

I don’t think it’s related to Avast but by removing it via a clean install you’ll get rid of Avast and then try. If it doesn’t work then it’s not Avast.

If it does work (installing programs) reinstall Avast.

  1. Download Avastclear, Rejzors uninstall tool and the appropriate Avast program edition

http://files.avast.com/iavs9x/avast_free_antivirus_setup.exe
http://files.avast.com/iavs9x/avast_pro_antivirus_setup.exe
http://files.avast.com/iavs9x/avast_internet_security_setup.exe
http://files.avast.com/iavs9x/avast_premier_antivirus_setup.exe

Avastclear : http://files.avast.com/iavs9x/avastclear.exe
Rejzors Uninstall tool: http://rejzor.wordpress.com/avast-cleanup-tool/

  1. Uninstall Avast by control panel [If you don’t have Avast in control Panel go to #4]
  2. Uninstall in safe mode using Avastclear.
  3. Run Rejzors Uninstall Utility in Normal Mode (removes traces avastclear doesn’t) - reboot.
  4. Install the version you downloaded.
  5. Reboot.

You can insert license file during install or after reboot. (If using paid version)
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