Windows 7 blue screen error BCCode:c000021a RRS feed

  • Question

  • Please help....I cannot solve the problems with many ways.

    Problem signature:
      Problem Event Name: BlueScreen
      OS Version: 6.1.7601.
      Locale ID: 1033

    Additional information about the problem:
      BCCode: c000021a
      BCP1: FFFFF8A004A65DF0
      BCP2: 0000000000000000
      BCP3: FFFFFFFFC0000001
      BCP4: 00000000000105B8
      OS Version: 6_1_7601
      Service Pack: 1_0
      Product: 256_1

    Files that help describe the problem:
      C:\Users\AS Joy Paul\AppData\Local\Temp\WER-53601-0.sysdata.xml

    Dump File here-


    Wednesday, November 14, 2018 7:42 PM

All replies

  • 1) To evaluate the BSOD please post logs for troubleshooting.

    Using administrative command prompt copy and paste this whole command.

    2) Make sure the default language is English so that the logs can be scanned and read.

    Choose the applicable link for the operating system:

    The command will automatically collect the computer files and place them on the desktop.

    3) Then use 7zip to organize the files and one drive or drop box to place share links into the thread for troubleshooting.


    This command will automatically collect these files:  msinfo32, mini dumps, drivers, hosts, install, uninstall, services, startup, event viewer files, etc.

    4) Open administrative command prompt and copy and paste the whole command:

    copy %SystemRoot%\minidump\*.dmp "%USERPROFILE%\Desktop\"&dxdiag /t %Temp%\dxdiag.txt&copy %Temp%\dxdiag.txt "%USERPROFILE%\Desktop\SFdebugFiles\"&type %SystemRoot%\System32\drivers\etc\hosts >> "%USERPROFILE%\Desktop\hosts.txt"&systeminfo > "%USERPROFILE%\Desktop\systeminfo.txt"&driverquery /v > "%USERPROFILE%\Desktop\drivers.txt" &msinfo32 /nfo "%USERPROFILE%\Desktop\msinfo32.nfo"&wevtutil qe System /f:text > "%USERPROFILE%\Desktop\eventlog.txt"&reg export HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall "%USERPROFILE%\Desktop\uninstall.txt"&reg export "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components" "%USERPROFILE%\Desktop\installed.txt"&net start > "%USERPROFILE%\Desktop\services.txt"&REM wmic startup list full /format:htable >"%USERPROFILE%\Desktop\startup.html"&wmic STARTUP GET Caption, Command, User >"%USERPROFILE%\Desktop\startup.txt"

    5) There are two files for you to find manually:

    a) C:\Windows\MEMORY.DMP

    Use file explorer > this PC > local C: drive > right upper corner search enter the above to find results.

    b) dxdiag:  

    In the left lower corner search type:  dxdiag > When the DirectX Diagnostic Tool opens click on the next page button so that each tab is opened > click on save all information > save to desktop > post one drive or drop box share link into the thread

    6) Open administrative command prompt and type or copy and paste:

    7) sfc /scannow

    8) When this has completed > right click on the top bar or title bar of the administrative command prompt box > left click on edit then select all > right click on the top bar again > left click on edit then copy > paste into the thread

    9) Upgrade the BIOS:  A10 > A15


    10) Open device manager > click view > click show hidden devices > manually expand all rows > look for any row displaying a yellow triangle with black exclamation mark or unknown device > post images into the thread




    Please remember to vote and to mark the replies as answers if they help.




    Wednesday, November 14, 2018 10:28 PM
  • Win OS Mini-Dumps are usually Virtual Memory settings,to fix..R.click my computer/properties/Advanced/Virtual Memory/Advanced/Change button..With C: highlited,set to "Let System Manage" click set 2X  close out,restart pc.This being Ram Memory is ok...
    Thursday, November 15, 2018 2:51 AM
  • Hi,

    Thanks for your posting.

    1. Did you make any changes to your computer recently for this issue to occur?

    2. Do you have security program installed on your computer?

    3. Would you please configure the kernel dump and upload the dump on OneDrive. Because the mini dump contains little information. Meanwhile, I will try to analyze the mini dump to see if can find the cause.

    Here are the detailed steps:

    1.ght-click "this PC", click "properties".
    2.ick "Advanced system settings", and click the "Advanced" tab
    3.ick settings under Startup and Recovery.
    4.lect "Kernel memory dump" under "write debugging information"

    5. restart the machine.

    Here is an article about code c000021a:https://answers.microsoft.com/en-us/windows/forum/all/blue-screen-error-c000021a-fatal-system-error/549075f8-f695-4047-b747-2b4e118e1ffd

    Best regards,

    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Thursday, November 15, 2018 3:32 AM
  • cora Zhou,

    1) The automatic memory is a better option for end users.

    The automatic memory dump is the very similar to the kernel memory dump.

    It will allow a larger paging file size.

    2) It can be easy for end users to miss BSOD when automatic restart is checked.

    When automatic restart is unchecked end users should see a BSOD window with bugcheck and : (

    Sometimes it may display a misbehaving driver in the form *.sys

    In summary the best settings for end users are automatic memory dump and to uncheck automatic restart.

    With these settings the end user will see the BSOD window and recognize that the computer crashed with a BSOD.  Otherwise the end user may guess that there was no BSOD or that it was a windows update. etc.



    Thursday, November 15, 2018 4:56 AM
  • HI,

    I have checked the minidump and I did not find much information related to this issue. 

    1. when you have configured the kernel dump and when the issue occurs again, please upload the dump to onedrive.

    2. please install the latest the patch to avoid the known issue.

    Besides, the minidump is not same as the automatic memory dump. Minidump indeed contains little information.

    Best regards,


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Wednesday, November 21, 2018 7:50 AM