|Go to |
hit "english", then (top left corner) hit "download", scroll down on that page and download the top version (spybot search an.... 1.4)
click "download here" beside it,
restart your computer in "safe mode" (after you've installed it) and run spybot.
Have you tried changing your home page in your "internet options"? Even if you haven't and now did, download spybot.
Post back with your results.