This is my first time building a computer, and I was given a brand new HP a1710n. Its got a AMD Athlon64 x2 4200+, runs Vista, and came equipped with a GeForce 6150 LE. I practically know nothing about building computers, and I figured I'd ask here. I'm planning on upgrading my ram and graphics card, but how do I know what card will work with my pc? If it came with a GeForce, is it basically wise to stick with GeForces (like, will any ol' GeForce work with it?). I'm under the impression that if it came with a GeForce, a Radeon is probably not compatible with it..but, basically I'm a noob who needs a few questions answered. Any suggestions on what card to get?