Random BSOD's and Freezes Hal.dll,ntoskrnl.exe

Welcome to 7F. Two of your three dumps are 0x124 which indicates a hardware fault, but, as with the majority of 0x124s, the dumps are giving nothing away as to what it might be. Your third dump however is a 0x116 which is a Video TDR Error (timeout detection recovery). This could be down to many factors that apply to your GPU; the driver, overheating, the card itself, insufficient power.

First off, here's your dump file from the 0x116.

Code:

*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck 116, {fffffa8006023390, fffff8800f1ce530, 0, 2}

*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
Probably caused by : nvlddmkm.sys ( nvlddmkm+14f530 )

Followup: MachineOwner

2: kd> lmvm nvlddmkm
start             end                 module name
fffff880`0f07f000 fffff880`0fce3000   nvlddmkm T (no symbols)           
    Loaded symbol image file: nvlddmkm.sys
    Image path: \SystemRoot\system32\DRIVERS\nvlddmkm.sys
    Image name: nvlddmkm.sys
    Timestamp:        Tue May 20 00:08:44 2014 (537A8EFC)
    CheckSum:         00C1EA41
    ImageSize:        00C64000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4

Download this earlier version from here and follow NVIDIA Drivers - Avoid Problems for the cleanest possible install.

Can you also let us know your GPU temperatures when idle and under load.

Try the driver linked, let us know the temperatures of your GPU and we'll go from there.

Excellent. Report back after testing with that driver.