I can start the game up and join a server without any problem, but as soon as I close the MotD that pops up when you first join, the game freezes for a few seconds and then crashes to desktop. On a few rare occasions it has gotten as far as the team select menu popping up, and only once I was able to see the class select menu, but no images would appear when you highlight each class. But in each of these rare cases it also froze and then promptly crashed to the desktop. If I join a server and don't close the MotD it will stay there indefinitely running at up to 60fps and what little I can see around the message box appears to be running smoothly.
Here is one other strange problem that occurred. When I tried to play HL2 again after all this meddling with AoC, the weapon icons had all changed. I tried to pull out my RPG to shoot down a gunship and wondered why Gordon was carrying a halberd...
I have installed all recommended support programs for windows, installed orange box sdk as well as TF2, and adjusted my game settings using a multitude of different configs that I have found on the Age of Chivalry site, including the dxlevel tip provided here.
Thanks for any assistance you might have to offer.