Don,
It does sound like your browser has been hijack. If you can search the internet for a site called "HiJackThis" These people have excellent tools to help you remove malware and spyware. You do have to know a little something about computers though. Also, another hint. If you are running IE7--After you remove your malware/spyware IE7 will need to be reset (I think that's what Microsoft calls it)anyway, if you go to Microsoft's website they will explain how to do this. It's a very simple process.
Good luck.
Teresa