Remove the peer-to-peer application such as Kazaa
that's causing the problem.
Run a good spyware removal tool such as Spybot Search and Destroy or
Adaware. http://www.safer-networking.org/ http://www.lavasoftusa.com/
Update Windows with all critical updtates.
Ensure your anti-virus software is updated with current virus definitions
and, do a virus scan of your computer, enable real-time virus scanning.
