We could not find any crash dumps so far. If you look in your steam userdata directory:
C:\Program Files (x86)\Steam\userdata\<steamid>\304730\local\crash_dump
Can you find any new crash drumps regarding your crashes latly?
Could you also please download this opengl-extension viewer
http://www.realtech-vr.com/glview/download.php
and submit a screenshot similar to this:
