You could try
Windows Live OneCare safety scanner: Free online tool for PC health and safety. I've used it before and it's pretty thorough, but it may take a couple hours.
If you do try it, you'll need to use your "Internet Explorer" browser, and do the "Full Service Scan".
Here's a couple related threads:
http://www.gnutellaforums.com/open-d...uld-aware.html http://www.gnutellaforums.com/limewi...ection-so.html