Your installation may have been corrupted, interrupted, or generally not installed properly.Your computer may be incompatible with the Game, check the back of the RCT3 Box against your Computers Specs (Right Click My Computer -> Properties)Best thing to do is to completely remove the game and try a fresh install, when asked if you want to do a Typical Install or a Custom Installation, choose Custom and make sure you select everything.Its also probably worth downloading the latest drivers for your Graphics Card. To find out..... (Right Click My Computer -> Manage -> Video Devices on the left side menu)