You are infected with a virus.
It would be best to do a complete scan of your system with your antivirus program, making sure that it has been fully updated to contain the latest virus definitions.
If you are running your computer without a current antivirus program then you are just asking for trouble. And that's just plain silly.
If you read the "Sticky"s at the beginning of some of these forums there is information there about what and how to do what is necessary to eliminate this problem.
Just uninstalling Limewire is not enough you have to actively hunt down this virus and let your anti virus software deal with it.
Try these two threads and see if either of them helps: http://www.gnutellaforums.com/open-d...setup-exe.html and http://www.gnutellaforums.com/open-d...uld-aware.html
they are about very similar problems to what you appear to be having.