What are your thoughts on adding "Create a new profile under Vista and test Halo 2 using that profile"?
It seems to be working for more and more people and honestly, it is a lot quicker than defrag, driver updates and the other items. Driver Updates are very important, no doubt there.
But maybe this will help out Gilgamesh and the GFWL team if they get a better idea of how many problems are resolved by creating a new Windows Vista profile.
Just a thought...