Hunter,

Does the original d3d9 (OS 1) work?

Are you making sure that you aren't running Xfire?

Since you're on Windows 7, you need to access the problem reports by clicking Start, then typing in "view all problem reports". Find Halo, find the most recent crash, and copy that here.

Also, if you hold down the control key while launching Halo, does it crash right at that dialog, or after you continue and you hit the loading screen (or the screen flashes)?