Well guys I'm pretty pissed about this too, this is 100% unacceptable as far as I'm concerned and I've disabled the adverts until I can get it straightened out.
If anyone can give us some feedback about how to verify and find the trojan and steps so users can remove it if infected I'd appreciate it.
I posted this on the wow forums but:
I THINK That is the correct method of removing winfixer. BUT, I dont know if thast a "legit" site or not. I used those programs before to remove it on my GFs PC about a year ago, and I have no idea if those are legit fix programs. Can someone corroborate?