Oracle Virtual Machine

Hello peoples i have and im a big problem,i install oracle virtual machine for create one virtual machine,install one game,run and received the error "sorry the aplication cannot run under a virtual machine" i read on others forum and video tutorials on youtube but nothing for help me,except this video but in my regedit no have this "Bios files"
anny of yours help me?,thanks

What OS are you running and what OS are you running in your virtual machine? What game exactly?

on my computer used windows 8,and Running Windows 7 on virtual machine,i test to play cabal online and other many games(dota2,league of legends,counter strike (for testing)) and same error

Did you consider the system requirements for each game? There could be problems with some 3D features. You can't also enable more than 128 MB of graphics memory in VirtualBox afaik.
In addition: Some games can't be played in a virtual machine, because they just block them.

i Create the virtual machime with 160 mb video(i show is maximum) and 4gb ram,probably no need to have problems

The Problem No fixed,anny or yours no have anny iddea how to fixed this?
Thanks

You have to delete all the "VMWare" entries in the registry.

Edit: Sorry I forgot you are using VirtualBox so you have to search for something like "VM" or "Oracle".