I got the same hijacking from a Bricklin site. It took me several days to cure it, and I'm still not 100%.
Ad Aware is more setup to deal with it than Spybot is. Immediately, one of those HTML files installed a Spybot killer. So now when I pop up Spybot, it dies immediately. I haven't cured that yet.
Adaware got my browser back this time. Do all the updates.
-> Steve