HaloMods "Classic" Read-only Archive

I tried running halo this morning and it gave me the DirectDraw problem screen. I ran dxdiag and checked to see if DD was enabled, and it says that all of the DirectDraw features are unavailable. Does anyone know how to fix this, it was working fine yesterday.

I have uninstalled and reinstalled halo to no avail, and it is affecting all of my games. I have the latest drivers for my videocard too.

Please Help!