Had the same problem man, combofix didn't even fix it. I tried so many programs that didnt pick it up. Avast, Avg, Spydoctor, Ad-aware etc... The one program i found that got rid of it is Hitman Pro 3.5. It's freeware and found the rootkit that was re-directing my browser. "Atapi.sys" located in C:/WINDOWS/system32/DRIVERS/. Once i scanned with Hitman Pro 3.5 if took away the rootkit and i havent been getting re-directs since. I still don't know why combofix didn't pick it up :S
Edited by RoryZ, 05 February 2010 - 09:57 AM.