I posted this in the Alternative Operating Systems section, but it didn't get much attention.
I've been playing C&C 3 on XP with no problems. Now that I have upgraded to Vista, it says that I need either DX9 which I obviously have, or I need to enable hardware acceleration. When I went to check if this was enabled, I found that my graphics drivers prevent me from changing hardware acceleration settings. I have the latest drivers.
Any idea what to do?