Scroll to the Optimizations tab and under the System Performance heading tick the box for High Quality and that's it close nHancer and start the game and you should see a small improvement at least. Now on the right hand side under settings with the enhancements tab enable AA-multisampling 4x & Anisotropic Filtering 4x or 8x.
NET 2.0 to run) the reason for nHancer is NV's own driver profile system is a pain to use.With that out of the way start nHancer click 'Profiles' from the menu and then on 'remove all profiles' as there are so many in the default NV driver that you don't need (you can get them back if you want later) add an entry for MX vs. When I checked out the demo there are a few tweaks you can do to improve the image quality but your spot on in that the original textures aren't that great so there is only so much you can do.Your using an NV card so the easiest thing to do if you have the latest drivers is to download nHancer specifically the latest 2.0 beta as the last official version doesn't work quite right with the latest NV drivers (note nHancer requires.