It MIGHT help if you turn all GFX settings to as low as possible, then make sure your resolution is also at the lowest possible setting.

A proper viedo card would help, a 64mb will run it, but don't expect it looking like a ferrari with somthing like a GeForce MX440. Like most things in life, you get out what you pay for.

I would reccomend at LEASE a Geforce FX7000 (GeForce 6600's will be comming out soon, it's a good buy) or a ATI 9600 or above. Anything below that is drastically outdated, and you're just thowing cash away.