I had the same problem, basically:
- ctr+alt+del not working
- limewire popping up after i shut it down
- "complete" file appearing as shared folder on limewire with 25,000 zip files.

I tried EVERYTHING mentioned, and managed to find and delete te complete file but everything else stayed the same.

thanks to ravendhi though, i downloaded ewido, ran a quick scan andnow the problems sorted!