system
4
Make sure you have Avast v.2021 on your HD to reinstall. What version of Avast are you running?
I would suggest that you uninstall Avast using the Avast uninstaller tool:
http://www.avast.com/uninstall-utility. Then Reboot.
If you don’t have a cleaner like CCleaner http://www.piriform.com/ccleaner/builds (select the Slim version on the bottom) and download it if you don’t already have it on your machine to get rid of cache and temp. internet files.
Install Avast as a Custom install; only install the things you want and need, then reboot. You don’t need the Avast Clean with CCleaner, so do not install it. Perhaps this caused the problem or if you upgraded Avast from a previous version this caused a problem, or if you had remnants of another AV or security software on your machine that can also cause a problem. We may never know.
Try doing this and let us know if this solves the problem.