Recently I am making use of the dell laptop which is running on to the windows xp operating system Which I essentially use for the playing games. And I use this for some time to access internet. I play some of the HD games like NFS, GTA. WOW in my machine. I am recently making use of the ATI Radeon high definition graphical interface. The trouble is that, in this morning when I tried to play a GTA 4 in my machine, in the machine so at that time I get the message that windows is not allowed you play this game. Is this difficulty for the OS or for another issue? Suggest me something to overcome from the problem.