I wouldn't have expected there to be someone with particular interest in Bitcoint talk accounts to produce a virus to steal them - means we all have to be even more cautious when browsing/downloading cyrpto related information now.
I'm guessing this is soemthing that wouldn't show up on any antimalware services (you could certainly try to uninstall the software and try to change it in your firewall settings or just reinstall your OS - which is probably recommended although I assume you already know and are running through these already).