Unexpected Crash, unexplainable

[ShotgunHobo]

Hello!
I'm having the strangest issue. My computer decides to crash, with no error message in site (just a plain reboot) whenever I attempt to play some games, mainly me and my friends' Civilization V game, however this has occurred in other games such as Garry's Mod and Just Cause 2.

However, I am 100% convinced this is not a game issue, nor an overheating problem- I have monitored the temperatures with hardware monitor whilst I play these games, and they never exceed temperatures which would overheat my PC and cause a crash.

Before I provide more details, here are my specs:

Processor: AMD A10-6700 APU
Graphics: GeForce GTX 660
RAM: 6GB
PSU: Corsair CX 500
OS: Windows 8.1

I have looked in the Event Viewer, and spotted something strange. Before the crash, four events happen (I once crashed three times in a night, and all of the events were the same in the same order.) These are the events:

In order of appearance:

Spoiler

___________________________________________________________

• 
  Volume C: (\Device\HarddiskVolume4) is healthy. No action is needed.
  
  Source: Ntfs (Microsoft-Windows-Ntfs)
  Event ID: 98
  Level: Information
  User: SYSTEM
  OpCode: Info
  Logged: 02/05/2015 20:59:21

___________________________________________________________

• 
  File System Filter 'npsvctrig' (6.3, ?2013?-?08?-?22T12:38:22.000000000Z) has successfully loaded and registered with Filter Manager.
  
  Source: FilterManager
  Event ID: 6
  Level: Information
  User: SYSTEM
  OpCode: Info
  Logged: 02/05/2015 20:59:22

___________________________________________________________

• 
  File System Filter 'eeCtrl' (6.1, ?2014?-?11?-?25T21:15:44.000000000Z) has successfully loaded and registered with Filter Manager.
  
  Source: FilterManager
  Event ID: 6
  Level: Information
  User: SYSTEM
  OpCode: Info
  Logged: 02/05/2015 20:59:22

___________________________________________________________

• 
  File System Filter 'BHDrvx64' (6.1, ?2015?-?04?-?04T05:27:40.000000000Z) has successfully loaded and registered with Filter Manager.
  
  Source: FilterManager
  Event ID: 6
  Level: Information
  User: SYSTEM
  OpCode: Info
  Logged: 02/05/2015 20:59:22

___________________________________________________________

• 
  The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
  
  Source: Kernel-Power
  Event ID: 41
  Level: Critical
  User: SYSTEM
  OpCode: Info
  Logged: 02/05/2015 20:59:22

___________________________________________________________

I am convinced that this is what crashes my computer. This is all the information I can gather on the issue- as I said, there is no crash screen.

If anyone knows anything about this issue, please let me know. Thank you!

 

[Black_Plague]

It may be an issue with your hard disk. Check your disk health and defrag it, etc.
Cause it is probably encountering a bad sector while trying to save game and crashing.