Computer Slowed to snail's pace after installing KB3012199, extreme difficulty running any program

Question

I've put off updating windows for a long time, yesterday I decided I might as well update as it's been almost a year. After installing the updates I ran into a plethora of problems: my mouse sensitivity had been changed, some desktop icons added, various
programs were installed that slowed start up. My Disk resources were constantly being pushed to around 100% at all times. I did my best to figure out what had been causing the problem, but couldn't pinpoint it. I decided my best option was to delete all of
the updates, and for the most part that worked. My mouse speed went back to normal, there were no more fishy background programs running, and I could actually launch applications without them moving extremely slow. This all lasted for about ten minutes, but
then my computer began to slow again and the same issues emerged. I went to check my update history again and there were two updates that I had installed yesterday that it would not allow me to delete. I googled them both and found that one, KB3012199,
had caused several people across multiple forums (including one here on microsoft that went unresolved) have had the same problem. I'm asking if anybody knows of any way to delete this update, or of a fix that has been released for it. This issue is a huge
let down, never did I think that updating my PC would break it to this extent. Any help is appreciated.

Answer 1

Unfortunately after you install this servicing stack update, you cannot uninstall it to revert to an earlier version of servicing stack update.
Try to create new user account as an administrator (it may not help).
Use the System File Checker tool to repair missing or corrupted system files
http://support.microsoft.com/kb/929833/en-us
In order to perform System restore :
How to refresh, reset, or restore your PC
S.Sengupta, Windows Entertainment and Connected Home MVP