Hi Andy, welcome to BleepingComputer!
Here are the programs you'll need to rid your computer of spyware and adware. Check for updates often for each of them. These will be your best protection against such pests in the future.
This one is to keep your Windows up to date and you should visit this site about once a month to see what your computer needs to be protected:Windows Updates
This is called HijackThis. It's absolutely vital in detecting most computer problems:HijackThis
This one is Spybot Search and Destroy, aka Spybot S&D:Spybot S&D
Adaware is great for finding problems with spyware and adware:Adaware
Those are the most important, in my opinion, and are totally free. I strongly suggest you start with those. Download them, install, and run them all. HijackThis can ONLY be viewed by experienced people. After downloading and installing HijackThis, come back here and post the saved log HERE
. An experienced member qualified to determine the good from the bad will tell you what needs to be done, if anything.
Good luck to you and we are always glad to help.
Feel free to ask ANY questions you might have.