move your mouse over "My Computer" and right click properties. You'll see a series of tabs. Click on "hardware" and then "device manager". in there you will see a list of all your installed hardware including your CD, the LCD screen, et al. Click on "display drivers". that will say either ATI Radeon 9700 or 9800. This is your graphics card, and I'm pretty sure yours will be a 9700, just based on my own experience with this card
If it is, you saw the other thread giving you some ideas on how to solve the problem. These guys and gals are amazing. Their solutions are very involved and leads to a tough, but gratifying learning curve if you have an interest in understanding how your pieces and parts interact. My solution was much simpler, as I tend to freeze, then panic a little when new equipment goes kablooey on me: download the Omega Driver from www.omegadrivers.net
Keeps asking questions, I think this forum, particulary the 9100/XPS group, is quite awesome!