In order for you to play LEGO Star Wars - The Complete Saga on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows XP SP2/Vista
Processor (CPU):
Intel P3 1.0GHz or AMD Athlon XP or higher
Memory (RAM):
156MB of RAM, 512MB required for Vista
Graphics Card:
128MB Graphics card with Shader Model 2.0 Capability
Hard Drive:
5GB of free space