You sound like you downloaded a virus in that zip file...I'd suggest you forget about limewire for the moment and do a complete system scan with your AV..
If that scan comes up with nothing and actually even if it does you should do a Highjack this log and go to one of these sites and have it checked...
http://forums.spywareinfo.com/index.php?showtopic=79038 http://www.bleepingcomputer.com/