In order for you to play Metro: Last Light Redux on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows Vista, 7 or 8 (64-bit only)
Processor (CPU):
Dual Core CPU (2.2+ GHz Dual Core CPU or better)
Memory (RAM):
2 GB RAM
Graphics Card:
DirectX 10, Shader Model 4 compliant graphics cards (GeForce 8800 GT 512 MB, GeForce GTS 250, etc)
DirectX:
Version 10
Storage:
10 GB available space
In order to play Metro: Last Light Redux on Windows with maximum graphics settings, you need a computer with a configuration no worse than the following
OS *:
Windows 7 or 8 (64-bit only)
Processor (CPU):
Any Quad Core or 3.0+ GHz Dual Core CPU
Memory (RAM):
4 GB RAM
Graphics Card:
DirectX 11 compliant graphics card (GeForce GTX 480 and above)
DirectX:
Version 11
Storage:
10 GB available space