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I have tried to install service pack 3 and my computer locks up with a Stpo: C000021a { fatal system error.. What do i do now??

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A Repair may fix this
if you have an installation CD not just a recovery CD?

A repair won't lose any data, other than Service Pack (if not on CD), any Windows Updates and unsigned drivers, which will need to be re-installed afterwards.
Stay offline and do a repair dnt go online without a firewall enabled. After that you install all Critical Updates next.

How to Repair
1.Boot the computer from your Windows CD.

2.When you see the "Welcome To Setup" screen press [Enter] to start the Windows Setup.

Note: Do not choose "To repair a Windows XP installation using the Recovery Console, press R", you Do Not want to load Recovery
Console.

3.Accept the Licence Agreement and Windows will search for existing Windows installations.

4.Select the XP installation you want to repair from the list and press [R] to start the repair. Setup will copy the necessary files to the hard drive and reboot.

5.Do not press any key to boot from CD when the message appears. Setup will then continue as if it were doing a clean install, but your applications and settings will remain intact.
if the problem continues after doing this then change the ram you are using that meana the ram should be part of the problem
i think this should solve the problem

Posted on May 27, 2008

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Blue Screen Stop Error Code C000021a {Fatal System Error}


This article is intended for advanced computer users. If you are not comfortable with advanced troubleshooting, you might want to ask someone for help or contact Technical Support.

When you use a server or a workstation that is running one of the operating systems that is listed in the "Applies to" section, you may receive the following error message: STOP: c000021a {Fatal System Error}
The Windows Logon Process system process terminated unexpectedly with a status of 0xc0000034 (0x00000000 0x0000000)
The system has been shutdown. Note The parameters in parentheses are specific to your computer configuration and may be different for each occurrence.

CAUSE:

The STOP 0xC000021A error occurs when either Winlogon.exe or Csrss.exe fails. When the Windows NT kernel detects that either of these processes has stopped, it stops the system and raises the STOP 0xC000021A error. This error may have several causes. Among them are the following:
  • Mismatched system files have been installed.
  • A Service Pack installation has failed.
  • A backup program that is used to restore a hard disk did not correctly restore files that may have been in use.
  • An incompatible third-party program has been installed.
The most effective way of resolving this issue is through:

Last known good configuration load
If the previous steps in this article do not resolve the problem, start the computer by using the last known good configuration. To start the computer by using the last known good configuration, follow these steps:
Note
Because there are several versions of Microsoft Windows, the following steps may be different on your computer. If they are, see your product documentation to complete these steps.
  1. Click Start, and then click Shut Down.
  2. Click Restart, and then click OK.
  3. Press F8 at the indicated time:
    • For an x86-based computer: When a screen of text appears and then disappears , press F8. (The screen of text may include a memory test, lines about the BIOS, and other lines.) There may also be a prompt that tells you when to press F8.
    • For an Itanium architecture-based computer: After you make your selection from the boot menu, press F8. There may be a prompt that tells you when to press F8.
  4. Use the arrow keys to select Last Known Good Configuration, and then press ENTER.

    NUM LOCK must be off before the arrow keys on the numeric keypad will function.
  5. Use the arrow keys to highlight an operating system, and then press ENTER.

Thank you for choosing FixYa! Have a good one. A 4 thumbs up and a comment will be greatly appreciated.

on May 26, 2011 | Computers & Internet

1 Answer

Blue screen error STOP: c000021a {Fatal System Error} The windows logon process System process terminated unexpectedly with status of 0x0000005 ( 0x00000000 0x00000000). The system has been shut down.


It appears that your Windows Registry is corrupted. You can try to use a Registry repair utility like CCleane to fix it. If that doesn't work you will have to reload Windows OS (Operating System). For more info no this error code Google "c000021a".

Feb 07, 2011 | Dell Computers & Internet

1 Answer

Sony vgc RB 30-I was putting in a graphics card on Friday for a dual monitor-vision Tek 7K 64MB DDR VTKRad7K64P. it said in the spotty directions to remove previous drivers for my old video card- which I...


The errors in computers make it miserable for their users to use them. They face so many problems when computers do not perform as intended. A very common error, which computer users can face, is the c000021a fatal system error.
This error is produced when it found by Windows NT kernel that either of the two processes Csrss.exe or Winlogon.exe has failed. Such processes could have stopped working due to many reasons like misaligned files being installed on the PC and a faulty restoration of files at the place where they were being used. In the event of such a situation, the Windows NT kernel stops the system and the stop c000021a fatal system error message is produced on the screen. This kind of a fatal exception happens when the PC can't tackle an exception and the program showing it needs to be closed.
This kind of a c000021a unknown hard error can be resolved by uninstalling the software that is not as per the needs of your PC. One can remove all the unwanted files present on the PC. An upgrade of the PC's operating system is also an alternative to restore it to its working condition and fix the stop c000021a unknown hard error.
The second solution to fix c000021a error from your computer is also very simple. You do not need to feel much hassled because of it. Just restart the computer. When the computer is booted, press the F8 button. Choose the last known good configuration and then press enter. This error generally happens when some software or hardware has been installed that is not as per the specifications of the PC. Therefore, after selecting the operating system you want for booting, the C000021a error will have been removed from your system.
However, it is better to utilize a registry cleaner software when the error still does not go away.
Windows registry includes all the information that is used by this operating system for carrying on with any operations like creation of documents. Windows Kernel uses all this information for executing the applications.
Registry cleaner software can ensure that the registry is cleaned of all the bad entries which have been causing an improper execution of files by Windows Kernel. Using this software is one of the most effective ways to fix the c000021a fatal system error. It can clean the registry without deleting any useful items from it which can lead to production of further errors.

Fix C000021a Fatal System Error is easy to do with registry cleaner. If you Scan Your Computer it will detect all the errors in your registry and safely remove them.

Dec 19, 2010 | Sony VAIO RB30C (VGCRB30) PC Desktop

2 Answers

C000021a fatal system error on screen display


your windows operating system is corrupted. you need to re-install it.

May 12, 2010 | Acer Veriton 7700G PC Desktop

2 Answers

STARTUP IS IN A LOOP, THEN:STOP:c000021a


In my experience, your computer's hard drive might be fried. I took a couple computer architecture classes and this seems to be the most reasonable answer. if I were you, i would find a computer technician just to be sure. Hope this helps, good luck
here are a few websites that might help
http://healyourchurchwebsite.com/2008/03/14/how-i-fixed-my-stop-c000021a-fatal-system-error-with-knoppix/

http://forums.techarena.in/windows-xp-support/771529.htm

Jan 01, 2010 | HP Pavilion a1610n PC Desktop

2 Answers

Blue Screen c000021a


Next step is remove hard drive and see if it is recognized in another computer. The Hard Drive could just be bad, but you need to rule out the motherboard drive controllers that could also be bad. Also try a known good drive in your system.

Char S.

May 27, 2009 | Dell Vostro 1510 Laptop Computer PC...

1 Answer

Error Message STOP:c000021a (Fatal System Error)


Hi, satagoe, That error means there is a error in memory block c000021a

reinstall the operating system.





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Oct 20, 2008 | Computers & Internet

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