Okay, it's apparent that you're infected. The question is, how badly?

Limewire continually popping up is consistent with one virus (see #4 in the following link):

http://www.gnutellaforums.com/open-d...uld-aware.html

Files turning into .zip files is consistent with another virus:

http://www.gnutellaforums.com/open-d...some-info.html

Hope this helps

Dan