here's one article.. not sure exactly what he had done.. or even if it was human error..?
Call of Duty 2 (with VISTA)
Infinity Ward's epic WWII shooter runs quite well, with no problems during installation or gameplay. Curiously, though CoD2 uses Punkbuster and we joined Punkbuster-enabled servers, we never got the permissions error we got in other games. It looks like you can play CoD2 online without checking the "run as Admin" box. Performance was just a little beneath Windows XP with no AA/AF applied, but enabling those features slowed things down considerably. It was still playable with our high-end card, but we're talking 38fps instead of 50fps. It's not as bad as the situation with F.E.A.R., at least.
As an interesting side-note: when we benchmark Call of Duty 2, reads our recorded single-player demo file from the main/demos subdirectory and then dumps out a results file in the same place. This didn't work under Vista at first, because the OS prohibits applications from writing to or modifying anything under the Program Files directory (where Call of Duty is stored) with limited permissions. If we run the game as Administrator, the benchmark results file is produced as expected.
not sure if any of this is relevant.. based on personal systems etc.
many other sites of which i haved posted yet