I came across a huge problem which GeForce 7 Series users have been suffering everywhere.
It crashed during the cutscenes, and wouldnt go past the first one, also the game was seriously jumpy.
They all got rid of their copies because of this error thinking it was an incomplete or false copy of the game.
Well it turned out it was a small registry setting which NVidia failed to tell everyone.
All you need to do is go into the registry [HKEY_CURRENT_USER\Software\Crystal Dynamics\Tomb Raider: Underworld\Graphics] and change the dword value of "DontDeferShaderCreation" to 0
I have also included a ready made regfile with a few other graphics settings, which you can install to save messing up your registry. Believe me, the game runs so much faster than before, and even the loading takes less than 10 seconds compared to 50 seconds without the fix. and if you want to keep the regfile for future installs, just throw it in your crack folder before you make your disks
By the way, thanks loads for the info on how to convert dvd9 to 2dvd5