Notebook?
http://store.steampowered.com/app/256390/

Minimum:
OS: Windows®Vista™ SP2, Windows®7 SP1 or Windows®8 or Windows®8.1
Processor: Intel™ 2.4Ghz or equivalent
Memory: 2 GB RAM
Graphics: NVIDIA® Geforce 450 or ATI® 6850 or higher (it must be able to manage Pixel Shader 4.0) with at least 512MB of display memory.
DirectX: Version 10
Network: Broadband Internet connection
Hard Drive: 18 GB available space
Additional Notes: Laptop versions of these cards are not fully supported. All OS are supported in 32 or 64 bit.Windows®Vista™ SP2 must be updated with KB 971644 (platform update to DX11)