['Sweeney' Todd]

apologies if this is wrong place for this post,i bought clod on disc from india and installed it with steam account,i'm getting all my options such as blue side,red side aircraft choice,video options etc,but when i click play my game jumps back to my desktop but i still get ingame sounds but no gameplay only thing i can think off is my nvidia 9500gt cant handle the game any ideas

I also have this same problem with CoD purchased as a download from Justflight via STEAM (yes it's crap but no choice).

I've tried uninstalling and reinstalling, plus latest nVidea and DX drivers but no change.