In order for you to play Torchlight II on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows XP SP3/Vista/Windows 7
Processor (CPU):
x86-compatible 1.4GHz or faster processor
Memory (RAM):
1GB System RAM
Hard Disk Space:
1.7GB free space (subject to change)
Video Card:
DirectX compatible 3D graphics card with at least 256MB of addressable memory.
DirectX®:
9.0c
Internet:
A broadband internet connection (for Steam download and online multiplayer) - Online multiplayer requires a free Runic Account