Gamespot has a feature about XP game compatibility with Vista (beta version). So far, HL2 isn't working. Oblivion works great. Wondering about Morrowind.
Morrowind GotY's box says it supports the following chipsets. I'm wondering if it will work with the 7900GT (is the card too new to be listed?):
GeForce 4, GeForce 3, GeForce 2, GeForce 256, NVIDIA TNT2, Radeon 8500, Radeon 7500, Radeon 7200, Radeon, ATI Rage 128, Matrox G550, Matrox G450, Matrox G400.
Of course, a P3 is recommended, so maybe the GPU is just too new to be listed.