Poor framerate with game- how to improve?. I just recently purchased a HP lappy (dv6815nr) and I

Question

I just recently purchased a HP lappy (dv6815nr) and I need some advice on what would be the best route for me to go;I was very impressed with the speed of the laptop up until I played World of Warcraft. The frame rate is not so great and actually effects game play SO I was trying to figure out what would be the best thing for me to do to up the frame rate because in-game options/prefs didn't help at all when I cut them all down to the bare minimum. It must be a hardware issue. Now, I was thinking either getting rid of Vista since it's such a Ram hog and putting in XP...OR...since my Ram is expandable to 4gigs-I would expand it. But, I'm at 3gigs right now so would it really make all that much of a difference? Or if you can think of something even better than the two options I was thinking about- please let me know! (besides buying a better lappy ^__^ )