My dad just reformated his Dimension 4200.
Not sure what DELL uses in the way or drivers, but I was gonna install sp2, then directx, then the latest nvidia drivers.
Install the Intel Chipset Utility. Also, SP2 includes the latest version of DirectX so there is no need to download that. Also, look into "Slipstreaming" SP2 into an XP installation disk. It cuts down alot of time.