you either have a virus or spyware on your computer. for virus besides whatever virus program you are using try www.grisoft.com for version6 free version not pro version. for spyware try http://www.lavasoft.de/ , http://www.safer-networking.org/?page=download, http://www.webroot.com/land/land-spysweeper6_6.php?rc=325 or http://www.aluriasoftware.com/homeproducts/spyware/, me i prefer lavasoft but then i haven't tried the others