Meh, trying to get it to run in 256Mb graphics? That's 4-5 year old technology FFS!
Bite the bullet....512Mb should be stretching to play on basic settings.
As an aside: As far as I know, if you don't have a 64-bit OS, there's no point in having more than 4Gb of RAM as the OS is limited to using about 2.9Gb. Even with 64-bit, there's no performance boost in going over 6Gb in 99.99% of cases. It's a way to save money, and that money is better spent on a higher graphics card. Similarly, high-end quad cores without high-end graphics cards (by which i mean 2 in SLI or XFire, or a dual chip single card) is a waste of money....you'll get bottlenecks in the video. People wanting to look at specs and builds etc can do a lot worse than spending a few hours in
www.tomshardware.com
Cheers