My dell XPS gets hung when i open some games

[AdX9170]

hey ppl i have some sort of a problem with my laptop.. most of the games that ive installed make my laptop get hung. i mean they dont even open at all and not jus get hung at a paticular title screen or something. these are the same installation files that ive used successfully on my desktop n the games work 100% fine there. the problem n confusion now is that well my laptop is a million times more powerful than the desktop.
Desktop:
intel dual core e series processor
2 gb ram and
512mb nvidia geforce 9400gt
Laptop:
dell xps l502x
core i7 2630qm
8gb ram
2 gb nvidia geforce gt540m
btw they both run windows 7 ultimate (x64) which has also been installed frm the same damn disk..
what do i do??