I just bought GTA3. I've installed it and when i go to play it where the menu should be it is all blocky. In the readme itis stated that they have problems with WinXP and GTA3. I have WinXP 5.1.2505 Build 2505 and to fix this problem i have to install a Service Pack which requires Build 2600. When I try to install it i get a message saying "You can only install this update on Build 2600 to Build 2600." Do I need a newer version of WinXP Pro? Is there anyway i can tamper with the registry to make it think i'm running Build 2600 to install this service pack?