Uninstall LimeWire and your current AntiVirus Software (to avoid your PC crashing later) and download Kaspersky Anti-Virus and install and run it! After a clean uninstall that software then reinstall your original AntiVirus and LimeWire and see if that helps
Good luck mate and hope that helps you! A hell of a lot of us got the same virus one way or another!
Regards
The Bishop