How do I Omptimize Gaming Performance on my Laptop?

I have a TOSHIBA Satellite L355 with a Genuine Intel(R) CPU 585 @2.16GHz 2.16GHz with a Memory of 3.00 GB and 32-bit Operating System. I find I'm unable to play many Games, even on the lowest settings, from World of Warcraft to Global Agenda and Divinity 2: Ego Draconis. I don't know much about Computers, so I was wondering if anyone could help me optimize my gaming experience?