Meh, you need to buy ram. And, since it's not a very expensive upgrade (in general), what are you waiting for? Seriously, if you plan to game you need at least 512MB (usually). A lot of people have like 1GB (or more), personally, I have 768MB. I had 512 a while, but I wanted to see what an extra 256 would do. Anyway, get another stick of 256 ram, and see how it helps. I'm seriously a little shocked you haven't already done that.

-adiemus