BearShare Lite is spyware free I recently did a comparison between Limewire and BearShare Lite you might want to read it there is U.SaveNow adware in but it is easily removed. The link below will take you there.
http://www.gnutellaforums.com/showth...threadid=45289
I see you recently installed Spyware Doctor I believe it has a tool called registry mechanic in it that fixes windows errors. If you have run one of these types of programs recently that could be your problem. I have tried allot of these types of programs and for some reason they seem to remove things windows need to operate properly. You may want to do a system restore to a point to prior to the problem starting.