Ok I'm a bit confused here, I followed what kc0rckx_finch wrote but:

1. there are no winupdates files in c:\windows\prefetch

2. I still can't open taskmgr with ctrl+alt+del, I opened taskmgr the way kc0rckx_finch said, it worked, the only process taking up the most CPU was System Idle Process so does that mean I have to end it? For some reason I can open regedit normally but not taskmgr

3. limewire still tries to open every few seconds...