A driver has been flagged in 1 of the crashes, possibly this is also the cause of the other crashes
In explorer please go to the following directory: C:\Windows\System32\drivers and search for a driver called mounthlp.sys
Right click this driver and choose properties, then click on details.
Please make a screenshot of the details and post them here.
4: kd> lmvm mounthlpstart end module name
fffff880`01e11000 fffff880`01e1f000 mounthlp T (no symbols)
Loaded symbol image file: mounthlp.sys
Image path: \SystemRoot\system32\DRIVERS\mounthlp.sys
Image name: mounthlp.sys
Timestamp: Fri Nov 14 15:54:31 2014 (546617A7)
Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4