I branched your reply to the other poster's question Judy because it's a completely different type of infection (I think. I'll check on that). As for ComboFix .... the forums such as BleepingComputer that deal with ComboFix all say that it's not a good idea to run it unless you're under the supervision of someone who knows the utility well. If your problem is fixed then all well and good, but I'd go and ask in one of those forums just to make sure.
Ex_Brit has listed some of the forums in "Anti-Spyware/Malware & Hijacker Tools" (where he also notes that RootkitRemover is supposed to deal with ZeroAccess).