Here ar the links to all you'll need. Click on the links, save the files to your hard drive (remember where you save them to) and install them one at a time. With AdAware, SPybot and Spysweeper, run the update functions before doing a scan on your system, then remember to update them before each scan (Once per week at least).
AdAware SE Personal
Spybot Search & Destroy
Spy Sweeper
Firefox Web Browser