Originally Posted by insurancegod
So I downloaded the demo but when i click on play, it just takes me to the trailer. Whats wrong?

Well that's hard to say from our locations. Better compare the system requirements to the list which you can see on steam:

System Requirements
OS: Windows XP™ (with Service Pack 3)
Processor: 2 GHz Intel® Pentium™ 4 Single-core Processor
Memory: 1 GB RAM
Graphics: 256 MB DirectX™ 9.0c compatible graphics card (nVidia® GeForce® 7900/ATI Radeon™ X1800 or better)
DirectX®: DirectX™ 9.0c compatible graphic card driver
Hard Drive: 2.5 GB free Hard Drive space
Sound: 100% DirectX™ 9.0c compatible sound card
Controller Support: Keyboard, Mouse

If these match (our your system is better) than go for it.