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