Limewire is a tool to share files, it is not responsible for whatever got into your system.
Maybe you downloaded an infected file, they mostly come with a .exe extension. If you didn't run a virus scan on an .exe file, then I'm sorry to say the fault is your own.
And as a side note
Did you receive any unsolicited emails recently ?
Reinstall windows and clear out the other garbage and you will have a fresh start.
Nothing is lost.. it just needs a good disinfecting.
