Sorry for the late response - been playing with the sand rail - However, currently running XP, Dell motherboard 0M2035 Dimension 8300,Bus Clock 800Megahertz, 1536 Ram, 2.80G Intel Pentium 4, NVIDIA GeForce MX 440 W/APX8X, CRT Monitor Dell E773c. Going to upgrade to LCD Monitor. Can play Microsoft Flight Sim X and a bunch of others that are 3+ years old. I was worried about the .8 power but don't know what I can do about it. I was looking at newer versions of Flight Sims but not sure if current card can handle anything newer. I have a laptop with Vista and in my opinion Vista #####. Soooo hoping 7 is somethin better. Think I should go to 2G Ram? Don't think this machine can actually USE more than 2G even though it's got slots(DIMM). When I ran the Microsoft Compatibility program for 7 they stated that the only upgrade I would need to do is the graphic card - again I am not sure if they are just trying to get you to just purchase with a thin ability to run full features or basic features.