BugCheck Codes –

  • Kernel_Data_Inpage_Error (0x7a)
  • Page_Fault_In_NonPaged_Area (0x50)

Issues Faced by OP –

  • Lots of bad sector errors in the Event Log
  • Random BSODs
  • Used chkdsk /f /r but this did not fix the issue.

What Fixed The Problem –

[quote]Then please run the following DISM commands to see if there’s any problems with the system (from an elevated (Run as administrator) Command Prompt). Press Enter after each one:
Code:[code]

Dism /Online /Cleanup-Image /ScanHealth
[/code]Code:[code]

Dism /Online /Cleanup-Image /CheckHealth
[/code]If the problem is fixable, you can use this command to repair it (from an elevated (Run as administrator) Command Prompt). Press Enter after typing it:
Code:[code]

Dism /Online /Cleanup-Image /RestoreHealth
[/code]From this article: Repair a Windows Image

Once this is done, also run sfc.exe /scannow from an elevated (Run as administrator) Command Prompt to check for further corruption.[/quote]

Link – http://www.eightforums.com/bsod-crashes-debugging/55624-bsod-windows-8-1-inpage-errors.html