Oh dear not good, you have a virus by the sounds of it...This can be fixed...
Go to Norbiesworld (his link is at the bottom of the this thread)
http://www.gnutellaforums.com/open-discussion-topics/41432-warning-viruses-network-you-should-aware.html
He is very good and he will get rid of it for you...
BTW you have done the right thing by not sharing at the moment....
