Might be because your graphics card has out of date drivers. A lot of support departments suggest to reduce the hardware acceleration on your graphics card to solve problems like these. You can reduce the hardware acceleration in the control panel on your windows system. On Windows 9x it can be accessed: Start > Settings > Control Panel. Then double clicking on the Display ICON. Click on the Settings tab and then the advanced.. button at the bottom. Finally click the Performance tab and slide the scale down a notch at a time and then test the game. It might help.