Does AVAST conflict with my Windows 7 Monthly Rollup download?

I can’t download Windows Monthly Rollup on my computer running windows 7. It has failed since last November. Is it possible that AVAST basic version software is not compatible?

Windows help says to ask if Avast has set the following REGKEY :

Key="HKEY_LOCAL_MACHINE"Subkey=“SOFTWARE\Microsoft\Windows\CurrentVersion\QualityCompat”
Value Name=“cadca5fe-87d3-4b96-b7fb-a231484277cc”
Type="REG_DWORD”
Data="0x00000000”

It may be time to do a clean install

Clean Install of Avast:
https://goo.gl/4Ptzkf
The answer to the windows question is YES.