Upon startup, I'm greeted with a "Cannot initialize DirectX, you may not have hardware acceleration turned on, yadda yadda..." message. I.E. I can't play the game.
And before someone slaps me with the "go get new drivers" and "patch it" responses, I've already done so. And since Bungie's support page is completely devoid of any tech help for the PC version outside of the most simplistic problems...
Anyone heard of something like this happening? Or have an idea on how to fix it?
EDIT: Okay, so I'm an ignorant sod for not looking hard enough.

Problem's traced to Reforce. Disabled it and it's workin' like a charm.