For the record, I've got to suggest PrevX.
When I had malware problems a while ago (initially noticed by some vague McAfee access-protection violation) I was scanning and submitting suspect files all over the shop. [I seem to recall about 25% of the online scanners recognised anything wrong with the files at all - but wouldn't agree on what the problem was.] I went through all the removers and/or manual steps I could find, but those bad files just kept coming back.
PrevX (which was free to download and scan - you had to pay for removal) only gave some kind of generic name for the infection but I decided to throw my £20 quid at them as a last resort because:
a) I was getting desperate: I was about to have to do a reinstall just as a work deadline was resuming;
b) Some prevx fellas were providing some extremely active and knowledgeable support on a forum somewhere and I think that was the only relevant mention of the combination of bad files I was finding on my machine.
c) IIRC, they had some deal where if PrevX didn't remove the infection they promised to personally investigate (like remoting onto your machine or something) - and was it a refund too?
(I'm definitely not affiliated or anything. Was just entirely satisfied by a product that did what I needed it to do at the right time. And, um, I'll renew my lapsed subscription next time I find a problem!)