Hi i recently brought the game PORTAL 2 for my windows vista hp, i brought the game off of amazon and added it to my Steam account. All went well downloading but when i go on my Steam account and click to PLAY PORTAL 2 the game starts off fine in till it reaches Menu/The start of the game, then the game shuts down and i get a Notification which says:
''Microsoft Windows
portal2.exe has stopped working a problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available.''
But i never get a notification... What should i do?
Please bare in mind that PORTAL 2 can be played only on Windows 7, Windows Vista and Mac.