Win32.Monster.fx is a fake threat. It is supposedly detected by Antivirus 2010.

Antivirus2010 is a corrupt security program. It reports nonexistent infections in order to scare people into purchasing a license of Antivirus 2010. Win32.Monster.fx is one of those fake threats. If your anti-virus detects Win32.Monster.fx, remove the anti-virus.

Click here to remove Antivirus 2010 malware.

Source: http://www.spywarevoid.com/remove-win32monsterfx-win32monsterfx-removal.html