Help with gaming..Can I upgrade a 5536g?

Hi,
My spec is:
AMD Turion x2 Dual-core module RM-74 (2.2GHz, 1MB 1.2 cache
4GB DDR2
320 GD HDD
up to 1791 MB ATI mobility Radeon HD 4570 HyperMemory

the game is Emergency 2012
It runs slow and stops working even when i put the setting of graphic to very low.

Cheers

Mike