Halo 2 error

I start the game, it gets half way through the Halo 2 loading screen, and then crashes and I get this messageI've tried looking it up, but I haven't come across anything.system specs:
Windows 7 Ultimate lite edition
Intel PentiumIV 2.8GHZ (HT enabled)
768MB DDR2 RAM
Nvidia Geforce 8400GS

Is it pirated or legit?

Might be corrupt