In order for you to play STAR WARS X-Wing vs TIE Fighter + Balance of Power Campaigns on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows XP/Vista/7/8
Processor (CPU):
1.8 GHz
Memory (RAM):
1 GB RAM
Graphics Card:
3D graphics card compatible with DirectX 7 (DirectX 9 recommended)
Storage:
487 MB available space