Windows 10: How to fix 0xc000021a, BSOD?

Currently I have reasons to believe that your HDD may be the cause of the issue, it would at least explain why you're able to run live operating systems.

How old is your hardware?
If it isn't too old, like not older than a few years, many things to repair the boot stuff won't work as they are meant for the old generation of booting.

Have you performed any tests on your HDD?

 

No, I don't remember doing it.
Once I had done quick test in Oct16.
No errors as I remember so maybe I ruled it out.
Pls recommend HDD tests.
Have 1TB HDD and I can't keep PC for too long this time so faster options are better.

 

Diagnostics Test

HDD TEST
*Arrow Run HDTune to

• check the health,
• scan for errors, no quick scan but full scan
• run a benchmark.

It may take some time, but please take the time you need to perform it properly.
When above is done please make screenshots of the following

• the health,
• the error scan,
• the benchmark incl. following
  • transfer rate,
  • access time,
  • burst rate,
  • cpu usage.

*Arrow Run SeaTools DOS to check the integrity of your HDD. SeaTools for DOS and Windows - How to Use - Windows 7 Help Forums
Run the long test.
*Arrow Run chkdsk
Disk Check - Windows 7 Help Forums
Use option TWO with parameter /r
Upload the chkdsk log *Arrow Check Disk (chkdsk) - Read Event Viewer Log - Windows 7 Help Forums

 

*Arrow Run HDTune to

• check the health,
• scan for errors, no quick scan but full scan
• run a benchmark.

It may take some time, but please take the time you need to perform it properly.
When above is done please make screenshots of the following

• the health,
• the error scan,
• the benchmark incl. following
  • transfer rate,
  • access time,
  • burst rate,
  • cpu usage.

*Arrow Run SeaTools DOS to check the integrity of your HDD. SeaTools for DOS and Windows - How to Use - Windows 7 Help Forums
Run the long test.
*Arrow Run chkdsk
Disk Check - Windows 7 Help Forums
Use option TWO with parameter /r
Upload the chkdsk log *Arrow Check Disk (chkdsk) - Read Event Viewer Log - Windows 7 Help Forums Thx.
Just started hdtune pro error scan .
Will do other tests after that.
Please note I have 931GB Western Digital WDC WD10EZEX-08M2NA0 (SATA). So is the seatools universal or not?

 

*Arrow Run HDTune to

• check the health,
• scan for errors, no quick scan but full scan
• run a benchmark.

It may take some time, but please take the time you need to perform it properly.
When above is done please make screenshots of the following

• the health,
• the error scan,
• the benchmark incl. following
  • transfer rate,
  • access time,
  • burst rate,
  • cpu usage.

Here is the HD Tune report.
Attachment 121222
Attachment 121223
Attachment 121224
Also I have System Reserved partition with odd files in it.
Had Remix OS with YUMI in USB which stored lot of files in it maybe[don't know why].
Can I delete it.
Attachment 121225Attachment 121226
Thx again.
Will post next tests soon.

 

The system reserved partition is normally not visible to the user, because it contains important files. If I remember correctly, this partition is used for the recovery and/or boot process.

That this partition is visible means that your partitioning is screwed up more than I had hoped. (It also means that your system is using the old generation of booting)
There may be a chance that the partitioning problem may be fixed, but if you'd like to get it fixed without a clean install then we'll need someone who is more experienced in this than I am in this.

 

Sorry for leading in wrong direction but I myself added drive letter in disk management to show the files to you. I did this because this drive would be available during windows 10 recovery options command prompt. So I got suspicious. Now I was running seatools for dos. When long test was running at about 11% I went have lunch. When I had just returned after about 10 minutes The PC have a continuous sound[Like UPS gives during overload] and everything on screen was messed up. The previously top appearance was missing, selected drive information dragged till top end having only repeated DST is supported or not or something. And screen had sorts of glitch[as if certain pins in monitor's plug had broken] having short lines of 0s and junk. Unfortunately I was too scared to take a pic and rebooted directly[Pressed CPU button once]. PC rebooted and loaded seatools for dos again . Now again I am running long test. This time it is at 40% now. Longer time than last time has passed.
Update: Passed so I think its irrelevent.
Also can lack of free space cause it?[Storage pic in earlier post]
Thx again for info.

 

*Arrow Run SeaTools DOS to check the integrity of your HDD. SeaTools for DOS and Windows - How to Use - Windows 7 Help Forums
Run the long test.
*Name: Views: Size: Attachment 121252
I will do next test tonight or tommorow.
How long will it take for Code: chkdsk[/quote] ?

Thx

 

Chkdsk could take several hours, and it may look like it hangs but it isn't hanging, just wait and let it finish.

 

*Arrow Run chkdsk
Disk Check - Windows 7 Help Forums
Use option TWO with parameter /r
Upload the chkdsk log *Arrow Check Disk (chkdsk) - Read Event Viewer Log - Windows 7 Help Forums I have a problem. No mention of wininit in event viewer(chkdsk too old).
So I used powershell command which initially failed to find path.Then I removed "/Desktop" from path which resulted in CHKDSKResults.txt file which is blank. What do I do?
Note: I ran command for C: partition(Windows 10).

 

If wininit isn't present and chkdsk is too old, then the question is if chkdsk finished properly?

 

I don't know(Sorry).
It was stuck 31%(normal I found out) so I left it alone and the next time I saw it the usual BSOD , automatic system repair failed screen was there.
Also the link that was given says procedure is for OS till Windows 8 only. Is there a different method to check chkdsk log in Windows 10?
Also the PC rebooted once or twice after due to BSOD. Do you think chkdsk log got deleted because of this?
Thx again for quick replies.

 

You can export the event in eventviewer directly.

The log won't ever get deleted, unless you tell a program to delete it (like in Ccleaner).
If no log exists, chkdsk could not finish properly and didn't write a log.

 

Heres the whole Application set(compressed txt). I know its not useful. Maybe someone can salvage something.
And I didn't use any cleaner. What should I do now?

 

All I can currently suggest is to run chkdsk again in command prompt with the /r switch.