Alien Invaders

The whole day has been taken up with angst over a computer virus/trojan/alien invader. This despite F Secure, Spybot and Windows Defender. Spybot won't launch, my browser is diverted to sites other than those I want, and the computer crashes if I try to look at help sites or access any removal tools. I am really hoping the gurus come up with a solution and I don't have to wipe the hard disk. Black day.