sounds to me like you have an adware/spyware problem..you can use AVG and SuperSpyWare to run on your PC which should take care of the problem..(I use them and have had no problems with that stuff)..
I can send you the .exe for both if you’d like..Freepmail me with an e-mail address to send them..
Interested...please please freepmail me also. I currently use AdAware, and SpyBOT