Random BSOD all of the sudden.

Hi and welcome to SF!

I suspect that this is hardware problem, either Ram or Graphic card

STOP 0x0000007E: SYSTEM_THREAD_EXCEPTION_NOT_HANDLED

Usual causes: Insufficient disk space, Device driver, Video card, BIOS, Breakpoint with no debugger attached, Hardware incompatibility, Faulty system service, Memory, 3rd party remote control,

nvlddmkm.sys was blamed in the DMP. The problem comes if your system has a Nvidia chipset or around 4 GB of RAM. First thing to try is to update the driver. When upgrading your graphic driver you MUST remove all traces of the current driver. In order to do that we recommend using http://www.guru3d.com/category/driversweeper/

When it is removed then download and install the fresh copy.
Other thing to try is to see if you can borrow another graphic card and try on your system.

Exception code ffffffc0000005 indicated memory access violation.
Download a copy of Memtest86 and burn the ISO to a CD using Iso Recorder or another ISO burning program. Boot from the CD, and leave it running for at least 5 or 6 passes.

BUGCHECK SUMMARY:

Code:

 
BugCheck 109, {a3a039d896ca7b20, 0, 53d17fffd9a23db4, 101}

Probably caused by : Unknown_Image ( ANALYSIS_INCONCLUSIVE )

Followup: MachineOwner
---------
BugCheck 1000007E, {ffffffffc0000005, fffff880100f67cb, fffff880063a4118, fffff880063a3980}

Probably caused by : nvlddmkm.sys ( nvlddmkm+2277cb )

Followup: MachineOwner
---------
BugCheck D1, {a, 2, 0, fffff88001060fa5}

Probably caused by : storport.sys ( storport! ?? ::FNODOBFM::`string'+b55 )

Followup: MachineOwner
---------
PROCESS_NAME:  Steam.exe

Run system file check please:

Open an elevated command prompt and enter sfc /scannow.

Let us know if you need help

Tuan