Nothing in LimeWire would cause that.
You perhaps got a file that had a little something extra and was not what you expected. Please run a virus check on all files you download..this will save you heaps of trouble.
Even then, you won't escape being infected again at some point.
You can always try online scan at housecall if your virus checker gets disabled.. keep the link to housecall in your bookmarks, you never know when you might need it
http://housecall.trendmicro.com/