What's wrong with my setup

[What's wrong with my setup]

EVGA nForce 790i Ultra SLI Motherboard CPU Bundle - Intel Core 2 Quad Q6700 Processor 2.66GHz OEM, Socket 775, ATX Motherboard

XFX Radeon HD 4870 Video Card - 1024MB GDDR5, PCI Express 2.0 x16, CrossFireX Ready, (Dual Link) Dual DVI, HDTV

is this a good start at what I might need let me know what else I could do or even give examples of some hardware that I good use instead of these

[What's wrong with my setup]

Any suggestions would be helpful I want to run the game high setting.

[What's wrong with my setup]

Amd atholon 64x2 dual core processor 4800+ 2.5 ghz. 3.0gb ram 32 bit operating system Nvidia geforce 6150 se nforce 430

I am not able to play even with the lowest settings. The game is cloudy and stutters real bad.