Menu Screens and Flight Painfully slow

G'day all.About a month ago I bought FS9 and ran it no problems on my Win98, AMD2000+ system with 512RAM and a GeForce2 card.Then I formatted my hard disk and upgraded to WinXP. After updating myBIOSVid DriversM/B driverSound DriverNetwork driverWindows upgrade packsAnd re-installing FS9, it has run like a mule. (A slow, stubborn Mule rather than a graceful cooperative Mule). The menu screens take roughly 20 seconds to load as I switch between eg Create a Flight and Saved Flights and the FPS during flight itself is very low.All my other games are running no problems but this is doing my head in. Any hints?Thanks in advance.Cameron