Windows 8 Pro cannot boot - Error 0xC000021a

Anonymous

I upgraded my son's laptop from Windows 7 to Windows 8 Pro. I has been working fine for a few weeks. But now when booting It halts iwth the error code 0xc000021a. I have tried the following options

Refresh - this fails with the error 0xc000021a

System Restore - this fails with 0xc000021a

Safe mode boot does not work

I can start the cmd console

Any suggestions as to how to proceed?

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107 answers

Anonymous

2015-01-15T21:54:48+00:00

Can you please tell me how you booted that way. I am ******@Hotmail.com I would appreciate the help. Thanks in advance.
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Anonymous

2015-01-15T00:29:03+00:00

I found a possible fix, in advanced settings go to System Restore and go back to yesterday's restore point or any point you have before the update. However you need to make sure to turn automatic updates off beforehand.
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Anonymous

2014-12-26T16:47:12+00:00

F8 does not do anything. Is there anyway to fix from command prompt?

What is your PC's brand?

Maybe in your PC you should use other key instead of F8 to show the menu i mentioned in my answer.
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Anonymous

2014-12-26T16:21:57+00:00

The given link --- http://www.regmender.com/how-to-fix-windows-8-error-0xc000021a.html --- does not seem operative.
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Anonymous

2014-09-30T10:57:36+00:00

Thank you.
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