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Windows 7: BSOD unknown reason, error c000021a. Please help

28 Dec 2014   #1
ramenstein

Windows 7
 
 
BSOD unknown reason, error c000021a. Please help

Hello guys, my computer will not startup. It crashes at the Windows startup screen with a BSOD that states:

STOP: c000021a
verification of a KnownDLL failed.

Sorry I don't know how to get you guys my system or dump files without being able to login windows to run the programs.

Things I've tried:
I've tried running Startup Repair and Startup Restore, starting with last known good configuration, and safe mode. All of them do not work. I was able to run Windows Memory Diagnostic with no memory problems. I've also tried running sfc /scannow in command prompt, but comes up with an error:

"There is a system repair pending which requires reboot to complete.
Restart Windows and run sfc again."


It has the same error after a restart so I used a workaround command "sfc /scannow /offbootdir=e:\ /offwindir=e:\windows" which comes up with this message:

"Windows resource protection found corrupt files but was unable to fix some of them. Details are included in the cbs.log windir/logs/cbs/cbs.log. For example c:\windows\logs\cbs\cbs.log."

I've also tried the command "dism /online /cleanup-image /checkhealth" but comes up with

"error: 50
dism does not support servicing windows PE with the /online option.
The dism log file can be found at X:\windows\logs\dism\dism.log."


This is not an easily solved problem for a non-tech savvy guy like myself. Any help would be greatly appreciated, thanks!


My System SpecsSystem Spec
.
28 Dec 2014   #2
Golden
Microsoft MVP

Windows 7 Ult. x64
 
 

Have you tried a Startup Repair from an installation disk?

Startup Repair
My System SpecsSystem Spec
28 Dec 2014   #3
ramenstein

Windows 7
 
 

I believe I have, but let me try again and I'll report back asap. Thanks
My System SpecsSystem Spec
.

28 Dec 2014   #4
ramenstein

Windows 7
 
 

It says: Startup repair could not detect a problem."
My System SpecsSystem Spec
28 Dec 2014   #5
Golden
Microsoft MVP

Windows 7 Ult. x64
 
 

Can you boot into Safe Mode?
My System SpecsSystem Spec
28 Dec 2014   #6
ramenstein

Windows 7
 
 

I couldn't last time I tried, but let me try again.
My System SpecsSystem Spec
28 Dec 2014   #7
ramenstein

Windows 7
 
 

Yeah, it doesn't work. It seemingly loads the drivers, then restarts itself.
My System SpecsSystem Spec
28 Dec 2014   #8
Golden
Microsoft MVP

Windows 7 Ult. x64
 
 

Mmmm....Recovery, Restore and Repair doesn't work. Do you have an system images from an earlier time prior to the troubles?
My System SpecsSystem Spec
28 Dec 2014   #9
ramenstein

Windows 7
 
 

No, unfortunately I don't :/
System Restore leads me to this message:

"System restore did not complete successfully. Your computer's system files and settings were not changed.
System Restore failed to extract the file (E:\$Recycle.bin\S-1-5-......) from the restore point.
The restore point was damaged or was deleted during the restore."
My System SpecsSystem Spec
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 BSOD unknown reason, error c000021a. Please help




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