I had got it working, but have just tried to run it lately and i get so far as the first splash screen before it goes back out of full screen and turns into this on my desktop, and goes no further.
Have to remove it via the task manager to close it, after which the exception error window pops up.
I've not messed about with any settings apart from going into game's properties and trying to run it in lower resolution.
The only other thing i can wonder is, i recently got hold of and installed SPV3 (HUGE singleplayer campaign mod, expands on every level and makes it more challenging, even in easy, awesome work, more weapons, more enemies such as brutes and flood types, highly recommend it, available at Halomaps.org)
But i could have sworn it was its own seperate program/entity/whatever so im not expecting it to cause these issues with the original copy of Halo. Ill uninstall it in the meantime but if anyone else has had the above problem and fixed it please let me know.