Fix For C000021a Fatal System Error Listed

Asked By Kevin Milton 0 points N/A Posted on - 06/30/2017

I want fixes for c000021a fatal system error on my Windows PC as because of that I am not able to do anything properly on my PC. Please help me out of this people. Thanks.

• Status: Open
• Question Views: 453
• Answer Count: 2
• Vote Up 0 Vote Down

• Answer Accepted: Yes
• Question Category: Hardware
• Question Tags: fatal system error

Best Answer by Sharath Reddy

Go To Solution

Answered By Diego Raymond 0 points N/A #300251

Fix For C000021a Fatal System Error Listed

These are the fixes for this issue which you can try-

1. First, you need to see that the drivers are updated

2. Then you need to run the chkdsk command in an elevated command prompt

3. Try removing and replacing the battery

4. Swap out RAM of your PC

5. If nothing works then go for a Windows system restore by going into start and then typing system restore and then select a suitable restore point.

One of the above will fix the error.

About Diego Raymond

Questions
1

Answers
4

Best Answers
0

• Vote Up 0 Vote Down

• Posted on - 06/30/2017
• Question Category: Hardware

Best Answer

Best Answer

Answered By Sharath Reddy 590495 points N/A #300842

Fix For C000021a Fatal System Error Listed

According to Microsoft, this problem normally happens when a user-mode subsystem like the CSRSS or Client Server Run-Time Subsystem or the WinLogon has been fatally compromised and security can no longer be guaranteed. When this happens, Microsoft Windows switches to kernel mode.

But since the operating system cannot operate without WinLogon or CSRSS, this is one of the few instances where the failure of a user-mode service can shut down the system. Another possible cause of the error is incorrect system files. This can happen if you restored your hard drive from a backup. To fix the problem, see when the error happens.

If the problem is triggered during system startup, try booting your computer using the last known good configuration setting. Restart your computer then press F8 before the Windows logo appears. In the “Advanced Boot Options,” select “Last Known Good Configuration” then hit Enter to boot into this setting. See if this works. If this failed, try remembering the last thing you did before the error happened.

If you installed a program or updated a driver, uninstall the program or roll-back the driver. See if this works.

About Sharath Reddy

Questions
1

Answers
14599

Best Answers
2290

• Vote Up 0 Vote Down

• Posted on - 07/13/2017
• Question Category: Hardware