Microsoft Flight Simulator 2

I am running WinXP Pro SP2 with a Radeon 9200SE video card, 128Meg of memory. When I start the game Microsoft Flight Simulator, the display output is lousy, very “jerky” as it displays the flight progress. I would think that with this machine and this video card the output should be a lot better? a Anybody have any experience and can shed some light? Please let me know. Sid Kraft Also, I have 1.5Gig memory, 160Gig hard disk, don’t know what else to do to get better performance!