To begin with LimeWire did not cause the problem, you did by downloading a file with the virus in it. Most of these viruses are found in software searches and file sizes of 900kb or less. And there is very few programs out there that small. Most are 10MB to 800MB when you do a search and see a bunch of files the same size with different names common since should tell a person there is something wrong here.
Like maybe it is a virus.
Any way go to link below you will have to register there they will help you get rid of the virus. And the next time you are on a P2P network make sure your anti virus is running and use a little common since when you choose the files you are downloading. If you are not sure about a file do a bitz look up on it before you click on download.
http://www.norbiesworld.co.uk/