Just thought I'd post this in case some people are still having problems with DirextX 10 crashes.
I'm running Windows 8.1 (preview) with a GTX 670. I solved the issue by using the video drivers provided through Windows Update. I had originally used the Nvidia GeForce Experience drivers (320.49 WHQL, July 1st), but kept getting crashes. I installed the WIndows Update driver over that and all seems to be stable now.