well there's your first problem...dont use search engines as your anitvirus..such as yahoo,aol, etc.. there a joke. use an oem like norton or i prefer avg anti-virus, it doesnt slow your comp. down and works great!! and its FREE. second.. you need to get a spyware protection, sounds to me you also have spyware on your system. try downloaded adawareSE and spybot, they are also FREE. try running theses programs and see what happens..