I'm having a different issue with a corrupt Avast install. My father was having an issues with his computer where Yahoo messenger wouldn't connect and Windows updates wouldn't install. I was trying to fix that when I noticed he had some Windows updates. I tried to install them but kept getting an error. I ran malwarebytes which found nothing then superantispyware which found a few but nothing major. Also some of his icons went blank. I saw the update for Avast so I went to update it and it seemed to update fine. I went to reboot the system and the screen went blank and wouldn't boot into Windows. I booted into safe mode and ran iobit uninstaller to uninstall Avast and it looked like it uninstalled fine. I booted back into Windows no problem. I uninstalled Yahoo messenger. I also found the Avast uninstall utility and ran it for Avast 7, rebooted then 6 (thinking maybe there was some stuff left over). I rebooted again, tried installing Avast 7 which seemed to install fine, opened it to look at it and the Protection Status tab was blank. I rebooted and the screen went blank again. So again booted into safe mode and ran the uninstall utility and again it seemed to uninstall fine. I rebooted into Windows again and noticed a few things. Windows Defender was disabled and Avast didn't uninstall completely leaving some locked folders. I tried to unlock them with file assassin with no luck then tried lock hunter also with no luck. I tried to install another anti-virus and it wouldn't install. I tried installing Windows updates again with no luck then tried Fixit utilities got an error with them as well. When I installed Avast again Windows Defender was enabled. And before anyone asks I did try system restore but the restore latest restore point was the day before and when I ran it it didn't fix the issue. I ran a couple online anti-virus' which found nothing.
I'm guessing he got a virus but either the damage is done and can't be fixed or I have to delete the rest of Avast. From Defender being disabled when Avast is uninstalled and re-enabled when Avast is installed it makes me think some of my issues have to do with Avast. Not being able to install updates or run Microsoft Fixit Utilities may not be Avasts problem. I'm not sure if I have to reinstall Windows or if there is something I haven't thought about. The only reason I haven't re-installed Windows is because there are a few programs he uses he can't find the disks for.
If anyone can come up with any ideas I'd be happy.