GTA 4

Minimum System Requirements

OS: Windows Vista - Service Pack 1 / XP - Service Pack 3

Processor: Intel Core 2 Duo 1.8Ghz, AMD Athlon X2 64 2.4Ghz

Memory: 1.5GB, 16GB Free Hard Drive Space

Video Card: 256MB NVIDIA 7900 / 256MB ATI X1900

DirectX version: 10 or better

Keyboard,mouse and gamepad

Link

via MediaFire 

Link  

via Direct (14.1gb)