How do I fix This specific keylogger?

Apparently I have a virus called: Trojan-Keylogger.WIN32.Fung It comes up through my firewall notification saying it records keystrokes and takes pictures of my screen, but my firewall is off and the only solution it says is to buy a 2009 Defender program. Now I have Avg free 8, Spybot S&D, Zone Alarm, and Malawarebyte's Anti-Malware. None of them have detected it so far. So far nothing on google has been able to fix this problem. If someone could help that would be great, it is a real neussance.