Not Run Under A Virtual Machine After Installed Bitdefender 2013 Plus

I have a few games before I installed bitdefender 2013 plus, everything is normal, can play the game ..after I installed bidefender 2013 plus I get an error in some games, for example n4f13, black ops 2

I run the game and get the message "Sorry, this application can not run under a virtual machine"

but when i remove bitdefender 2013 plus, no problems, and play any game

how I do fix this..