TKS is correct. the GeForce2 MX display card is a DirectX 7 card - it doesn't have Hardware Transorm & Lighting!
But you should still be able to install DirectX8 or DirectX9, and run games. You will not be able to use all the features is all. Many games are 'scalable', which means that although they are DirectX 8 or DirectX 9 games, they can be run with the relevent features disabled. The fact that you cannot run DXDiag is rather strange, and you may have some system corruption, possibly as a result of attempts to install/uninstall drivers (or perhaps DirectX itself) that have not been fully successful.
By far the best way to clean up and repair any system corruption that may have occurred i to format and install fresh.
Catweazle
Grandad
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