Re: setting up Direct X ingame
If you cannot select DirectX 9, then your card does not fully support the features necessary to run the game in DirectX 9. You can try updating your drivers from NVidia if you haven't already, but to the best of my knowledge, the ti4800 is not a DX9 card.
Just because you can't run in DX9 does not necessarily mean you will crash once you reach u4 02. Play through and see what happens - if it does crash, you can wait for the patch on wednesday, if not - great!