Background

This article describes how to recover from the issue described in the KB200: Recovering from a bluescreen caused by installing DESlock+ on Windows 8.1 with November 2014 Rollup when the Workstation does not have System Restore enabled.

If the Workstation has System Restore enabled we recommended you follow the steps described in KB200.

Recovery Steps

note: If the workstation is encrypted it must be decrypted using a DESlock+ recovery iso before any recovery can take place.

 

• After resetting the machine that bluescreens at startup, Windows will boot and will enter the Windows Recovery Environment.
  
  From the Choose an option screen choose Troubleshoot.
  
  
  
  

• In the Troubleshoot screen, choose Advanced options.
  
  
  
  
  

• Open the Command Prompt from the Advanced options screen.
  
  
  

   

• After providing any credentials required the Command Prompt will be displayed.  

  In the Command Prompt type bcdedit | find "osdevice"

  In the output the drive containing the actual Windows installation is shown in the output text.

  Example output:

  osdevice partition=C:

  In this case, C:. Take note of this.

  
  
  
  

• In the Command Prompt type regedit.
  
  
  
  
  
• Registry Editor runs.
  

  

  
  
  
• Select HKEY_LOCAL_MACHINE.
  
  
  
  
  
  
• Using the File menu choose Load Hive.
  
  
  
  
  
  
• Browse to the drive you noted in Step 4. Then browse to \Windows\System32\config and open the file SYSTEM.
  
  
  
  
  
  
  
• In the Load Hive dialog we need to name the key under which the hive will be mapped in Registry Editor.

  Type REPAIRSTARTUP and click OK.
  
  
  
  
  

• In Registry Editor you will now be able to see a key called REPAIRSTARTUP.
  
  
  
  
  
• Open REPAIRSTARTUP and find the DumpFilters value under ControlSet001\Control\CrashControl.
  
  
  
  
  
  
• If the DumpFilters value contains dlpfde.sys, remove it from the list. Ensure all other values remain on individual lines (typically just dumpfve.sys remains).
  
  
  
  
  
  
• Verify that dlpfde.sys is now not visible in the DumpFilters value.
  
  
  
  
  
  
• Repeat steps 12 through 14 with all other ControlSet002, ControlSet003 etc keys if they exist.

  Once done, Close Registry Editor, then close the Command Prompt to return to the Choose an option screen. Choose the Continueto boot into Windows 8.1.
  
  

  
  
  

   

• Once Windows starts it is expected that an error will be shown saying that DESlock+ is not installed correctly.
  
  
  The error displayed is:

    An error occurred communicating with the DESlock+ subsystem.
  
    The DESlock+ software may not be installed correctly.
  
    Error timed out
  
  Additionally when More >> is clicked will show the error (Error 0xC01C0007 reported by "DESlock+ API").
  
  
  To remedy this install DESlock+ v4.7.5 or newer (if available).
  
  
  

  

Keywords: BSOD blue screen bluescreen