The error is caused by the Nvidia Video driver
Please read this thread from Geforce as a possible solution for the problem.
Code:
*** WARNING: Unable to verify timestamp for [COLOR=#ff0000]nvlddmkm.sys[/COLOR]
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
I assume the other crashes don't happen anymore?
Because the most current of the 3 dates from July 9th.