Starting last night... JKA crashes every time I try and launch it sp/mp. crashes as soon as I launch it, and I don't think I've changed anything or added anything since it was working last time. Trying to figure it out.
Try resetting the computer, then run the game first thing.
If you run UU look at the console as it will have the information last displayed it in - it also has a crash reporter built in. Also, if you do run UU, try running JKA without it!