I'm also having crashs on this game that freezes my PC with the sound looping with a 5770 crossfire setup, my drivers are also the 12.3 with cap 1, i tried disabling crossfire with radeonPro and it worked for some time but then it crashed again, it is not crashing in any place in particular like you guys it just randomly crashes during game play with crossfire off (at lest i think radeonPro is disabling crossfire) or during save loading when crossfire is on.
Intel Q9550 Quad core
8GB of Ram
Crossfire HD5770 (different vendors)
CT 12.3 Cap 1
Creative Audigy 4 with driver ( Daniel K Audigy support pack 3-8)