Anti-Virus 2009 is one of the
worst. Hiding itself as a 'useful' program, this tool claims to
'clean your PC' but instead infects it 10-fold. See the
screenshots below for examples of this nasty application:
Anti-Virus
2009 Screenshot
Anti-Virus
2009 fake 'warning' dialogs
Vundo:
Another really nasty virus /
Trojan. This one gets on your PC through various malicious
websites and pop-ups. Among some of the other things it does,
it disables the built in security features of Windows, leaving
you more vulnerable to infection. We've enclosed a couple of
screenshots below to show you some of the warning signs of this
piece of malware.