I was thinking that you guys at avast are the experts at malware and viruses, and that your software stops 99.9% of them from infecting machines. But it sounds like you don't know what I'm talking about? Hmm - that's not very reassuring.
Unfortunately, I don't have time to run through the diagnostics suggested and contact someone from Malware etc., so I opted for a System Restore and deleted/reinstalled Firefox, which seemed to be the browser affected. So far so good.
If you guys get time, can you look into the virus we've reported? I don't think it's extremely dangerous (didn't wipe the C drive or anything) but it's very annoying.
Thanks