Has been discussed many times in the Computer Help and Spyware forums.
Please try what they discussed there. It's a new malware that disables the antivirus. Try bootable antivirus CDs too.
I keep getting "windows security alert" on my taskbar, and when i try to run any other program or antivirus program i get this message "application cannot be executed", followed by "the file xxx is infeted." #do you want to activate you antivirus software now"
How do i remove this, since i can't start anything?