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MSE Malfunctioning, Windows Update Error C80003FA, and More
A while ago I built my own computer, and it worked fine for about two weeks. However, since then, it has had many errors and problems with programs. After wiping my drive and reinstalling countless times, I've kind of been able to get it to work (I'm using the computer to write this), but I can't do any Windows Updates (it gives me error C80003FA) and Microsoft Security Essentials has gone crazy (can't update, won't scan), so I'm running it without any antivirus. I tried running MalwareBytes, but when I tried to download it, it wouldn't install and told me that the download was corrupted.
I've searched for solutions to the Windows Update Error, and many people suggested restarting the Windows Update service, renaming the folders, etc, and none of it has worked. When I try to update Microsoft Security Essentials, weird things happen. The progress bar goes to the end, but before it's about to finish, it goes back to the beginning and starts again. Then, just before it finishes, it stops and says that it failed to connect and can't update. Also, when I try to refresh the Windows Experience Index, it errors in the middle of the assessment and closes.
I don't know what could be causing these problems, my best guess is some sort of virus, but that doesn't make sense either as I've wiped the drive multiple times and flashed the BIOS as well (just in case it was something in the BIOS). Any help would be appreciated. Thanks.