In order to run the game without any issues, your computer needs to meet the minimum system requirements:
- OS: Windows 95/98/XP/ME/Vista/7;
- Processor: 800 Mhz or better;
- RAM Memory: minimum 1024Mb;
- DirectX 9.0 or higher;
- DirectX compatible sound board.
If the requirements are fulfilled, uninstall the game using its uninstaller and run CCleaner. After that, download a new copy from an official source and install it following the self-explained instructions. This should fix the problem.