COD :World @ War not running in Vista...

Hi latest version of COD is not working in my frnds laptop (Vista)
whereas the same setup is running fine in XP...

What 2 do 2 make it work in vista.....

i tried some tweaks like setting sound options to 22khz 48000 but dat didn't work

i hope there is a way 2 get it 2 work...