You know that Win7 is no longer supported by MS, so continuing to use it while hooked to the WWW is a really really bad idea. What brand of cpu is it? Some of them have the ability to wipe their drive and reinstall as new, but you lose everything you personally had on it that way.
You could get a new computer running Win10 pretty cheap if all you do with it is run the internet. Not so cheap maybe if you need to do other things that require Office or other programs. Either way, you can remove the hard drive from your non working cpu and insert it in one of the USB to SATA docking stations(about $30) and retrieve your documents and stuff from it and copy them to your new cpu if you go that route.
And thank goodness. Half the updates always messed it up. Turned them off a good while back.
I use mine every day with a VPN, an anti-spyware program, an anti-malware program and a (very old) firewall program running simultaneously. I also keep the Microsoft Update turned off. Works fine.
As to the original poster, among the other possible solutions is to get to a command prompt and run CHKDSK and it will check your hard drive for bad sectors and fix them if possible. Takes a little time but well worth it.