Crash dumps shows "Virtu MVP" as the probable cause of your problem.
Driver Reference Table - VirtuWDDM.sys
fffff880`03771268 fffff880`046922eeUnable to load image \SystemRoot\system32\DRIVERS\VirtuWDDM.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for VirtuWDDM.sys
*** ERROR: Module load completed but symbols could not be loaded for VirtuWDDM.sys
As far as i know, this software is used to switch between on-board video and dedicated graphic card which is an absolutely unnecessary fuction for a desktop PC. Please uninstall this software completely from the system at least as test and report how the system works.
Also, please uninstall "Asrock App charger" as it is not recommended to use with 'Windows 8".