my problem is when ever i go on my free drive missions it goes all stuttery and laggy and is impossible to drive any vehicle,but when i run the game on my dads it is fine. my computer is much better than my dads so i dont know why it does it. i own the deluxe edition of SC4. My comp details: Microsoft window XP, media center edition, version 2002, sevice pack 3,v.3264,intel R core 2 CRU 6420 2.13 GHz,2.00 ram, direct x 9.0, 256 mb radion X1550 ATI graphics processor. I dont know the details of my dads thoughbut i do know it is xp basic and it has a nvaia 256 graphics card.