You need to first make sure you put a short cut on your desktop or the setup.exe for the game and choose compatiablity for 98 or 95. Do a full install. Now you need to patch it with 4.5 patch. You are not finished yet. You need to take a file from Need For Speed - Porsche Unleashed called dx7z.dll from the driver folder of the game. Rename it to d3da.dll and put it in Need For Speed 4 folder and replace it with the one that is in there. Now run. 3dsetup, choose what video, more likely direct3d 1. if it doesn't know your card and say ok. Now run the game.
