Have you read this?
http://www.betaone.net/forum/thread-15529.html
Unfortunately this has been going on for a few days now and the offending file will be more difficult to find. But odds are you have an exe or dll in one of these folders "windows" "system32" "system" or "internet log" (most likely system32).
A few months ago I was hijacked by "Your Search". My spy removers found it but everytime I rebooted it came back. In the end I found a .dll in system32 that bore no relation to "your search". It was called something like "xcdmilf.dll".
You might also want to try your system restore and go back to a date before you ran into this prob. Good luck!
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