Question about Microsoft Windows XP Professional for PC

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Hard error : STOP C000021

STOP C000021 unknown hard error\system root \sytem32\ntdll.dll

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This is a common error
just copy or download ntdll.dll file from the net and replace the file in ur disc
then just make a new bootable iso file and burn into a new cd
restart the comp,install and enjoy
Shreyas
Cheers

Posted on Mar 29, 2009

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Ie shows error message(, ModName ntdll.dll.) then shuts down when I use USB storage drive. I have removed Internet explorer but still shows the error message and shuts down


The causes of ntdll.dll error messages can vary greatly. However, most ntdll.dll errors result from a corrupt or damaged version of the ntdll.dll file itself, corrupt hardware drivers, or issues between Windows and other programs.
Ntdll.dll errors can sometimes mean that a piece of hardware in your computer is malfunctioning, but this is rare.
Resolution
1.Restart your computer. The ntdll.dll error you're receiving could be due to a one-time, temporary issue and a simple reboot may resolve the problem completely.

2.Reinstall the program if the ntdll.dll error only displays when you use a specific program.
If the software program has any updates or service packs available, install them too. The software's programmers may have identified an issue with the program that caused the ntdll.dll error and then issued a patch for it.
Note: Third party software programs that have been installed on your computer are almost always the cause of ntdll.dll errors. The remainder of these troubleshooting steps resolve ntdll.dll issues only rarely.

3.Check the Windows service pack level you're running and then check Microsoft's support site to see if there is a more recent service pack available for installation. Some issues that caused ntdll.dll errors have been corrected in these service packs from Microsoft.

4.Selectively disable Internet Explorer add-ons. If your ntdll.dll error is displaying when you start, run, or close Internet Explorer, an add-on may be causing the problem. Disabling each add-on, one by one, will determine which add-on is the culprit (if any).
Note: As a workaround, assuming the ntdll.dll error really is Internet Explorer related, install and use a competing browser like Firefox.

5.Rename the NLSPATH system variable. If your Windows system does not have this environment variable, skip this step.
Note: This is a troubleshooting step for this issue only. Be sure to set this path back to its original name if this does not resolve the ntdll.dll issue.

6.Disable Data Execution Prevention for Explorer.exe. As in the previous step, this is for troubleshooting the ntdll.dll issue only. If this doesn't resolve the problem, return the Data Execution Prevention settings to their previous settings.

7.Update drivers for any hardware in your computer where updated drivers are available. Outdated drivers sometimes cause ntdll.dll errors.

8.Test your memory for damage. If you're receiving ntdll.dll messages, one possible cause could be a bad memory module in your system. Testing your memory will either identify a problem or clear your RAM of any responsibility.
Replace your memory if it fails any of your tests.

9.Ntdll.dll errors could occur if you have an Iomega Zip drive on the same IDE cable as the hard drive inside your computer. If so, move the Zip drive to a dedicated IDE controller.

10.Replace the IDE cable connecting the hard drive to the motherboard. If this cable is damaged or malfunctioning, one symptom could be the ntdll.dll error you're seeing.

11.Repair your installation of Windows. If individual software reinstallations fail to resolve the problem, a repair installation of Windows will replace the ntdll.dll file.

12.Perform a clean installation of Windows. A clean installation will completely remove Windows from your PC and install it again from scratch. I don't recommend this option unless you've exhausted all previous troubleshooting ideas and you're comfortable that the ntdll.dll error is not caused by a single program (Step #2).
Note: If a single program or plugin is causing the ntdll.dll error, reinstalling Windows and then reinstalling all of the same software may lead you right back to the same ntdll.dll error.

13.While extremely rare, if everything else has failed, including the clean installation from the last step, you could be dealing with a hardware issue with your hard drive.
If so, replace the hard drive and then perform a new installation of Windows.

Jul 20, 2011 | Microsoft Internet Explorer 8

1 Answer

STOP C0000221 erro de hardware desconhecido systemroot system32 ntdll.dll


You may receive one of the following stop error messages while working on your Windows XP computer.
STOP: C0000221 unknown hard error
Path\File_nameSTOP: 0xC0000221 unknown hard error
C:\Winnt\System32\Ntdll.dll (or another specific file or driver)
STOP: 0xC0000221 STATUS_IMAGE_CHECKSUM_MISMATCH
Path\File_name
Note: The error message may be discussed in many different formats-blue screen or message box. It depends on when the corrupt file was detected.
Similarly, you may receive the following STOP messages when a critical system file fails to load on your Windows NT and Windows 2000 computer.
STOP: C0000221 unknown hard error
<path>\<file_name>STOP: 0xC0000221 unknown hard error
c:\winnt\system32\ntdll.dll
Note: Some other drive may also be given in the message.
On Windows 2000 the following error message may display:
STOP: 0xC0000221 STATUS_IMAGE_CHECKSUM_MISMATCH
<path>\<file_name>
You usually face this problem when an incorrect driver for one or more hardware is installed on your system. For instance, the error messages described above are displayed when you install a millions of instructions per second (MIPS) driver on a x86 system.
Cause of the Error
This error occurs if the file given in the error message is damaged.
Your Windows XP operating system checks the following files for integrity during system startup:
  • All driver files, excluding the files that loaded using the system loader to start your system .
  • All DLL (Dynamic Link Libraries) on the system. These include, Graphics Driver Interface (GDI), User, Ntdll, Crtdll, Shell, Kernel and several other DLL files on the system.
  • On Windows NT and 2000 computers, all DLLs loaded in the Window server address space are also checked.
The problem may also occur if an Iomega Zip drive is connected to the same cable as your hard disk drive.
Resolution Method
You can resolve this issue by removing the corrupt driver from your computer and then reinstalling a fresh and healthy copy of the driver. You may need to use the Device Manager utility to remove the driver. It is recommended that you clean your registry with the help of a reliable tool, such as RegGenie to ensure that all entries related to the uninstalled driver are removed from the system. After you have completely removed the corrupt driver, restart your system and install a fresh copy of the driver on the system.
If this step does not resolve the problem, you may have to reinstall Windows XP.
It is recommended that you regularly clean your registry with the help of a registry cleaner tool and perform antivirus and antispyware scan using tools, such as Antivirus Plus and StopZilla to prevent such errors from occurring on your system.

GOOD LUCK :-)

Feb 03, 2010 | Intel Computers & Internet

2 Answers

When i start my computer i get this message: stop: c0000221 UNKNOWN HARD ERROR /SYSTEMROOT/SYSTEM32/NTDLL.DLL what can i do?


I have a wipro laptop. i install windows Xp .But my system could show the operating system error . Then I am reinstalled Windows Xp. But the system will turnoff.

Dec 16, 2009 | Acer Aspire 5050-3242 Notebook

1 Answer

C0000221 Unknown Hard Error\System32\ntdll.dll


From MS's KB:

http://support.microsoft.com/kb/314474


Feb 06, 2009 | Microsoft Office Professional 2007 Full...

1 Answer

Unknown Hard Error


It's probably a corrupted file on the hard drive due a variety of reasons. A simple defrag might fix it but it's unlikely, so it is probably preferable to a Repair function from your XP install CD. These kinds of errors with XP were not uncommon. After the Repair assuming it works and I'm fairly certain that it will, defrag your hard drive and then start getting the new updates for your system.
Illustrated procedures located here

Aug 26, 2008 | ASUS P4VP-MX Motherboard

1 Answer

Windows xp installation


HI,

Here is what the Media test failure check cable eiting PXE ROM means:
Iam sure when we were changing some settings with the BIOS you must have done something wrong.Just reemember if you changed some settings over there.

try change the boot-order in the BIOS
try to disable "network-boot" in the BIOS.

This issue is often caused by either an incorrect setting in BIOS or a bad boot device, such as a bad hard disk drive. To resolve this issue,Isuggest you go through the steps in document CH000229 relating to a similar error message.

Now coming to System32\ntall.dll unknown hard error:

Restart your computer. The ntdll.dll error you're receiving could be due to a one-time, temporary issue and a simple reboot may resolve the problem completely.

If the ntdll.dll error only displays when you use a specific software program, uninstall the program, reboot your computer, and then install the latest version again from scratch.
Update drivers for any hardware in your computer where updated drivers are available. Outdated drivers sometimes cause ntdll.dll errors.

Test your memory for damage. If you're receiving ntdll.dll messages, one possible cause could be a bad memory module in your system. Testing your memory will either identify a problem or clear your RAM of any responsibility.

Perform a repair installation of Windows XP. If individual software reinstallations fail to resolve the problem, a repair installation of Windows will replace the ntdll.dll file. Remember to install all Windows service packs and other patches after this installation.

Perform a clean installation of Windows XP. A clean installation will completely remove Windows XP from your PC and install it again from scratch. I don't recommend this step unless you have stepped through all previous troubleshooting steps and you're comfortable that the ntdll.dll error is not caused by a single program (Step #2). NOTE:a single program or plugin is causing the ntdll.dll error, reinstalling Windows and then reinstalling all of the same software may lead you right back to the same ntdll.dll error.

While extremely rare, if everything else has failed, including the clean installation from the last step, you could be dealing with a hardware issue with your hard drive. If so, replace the hard drive and then perform a new installation of Windows XP.

Apr 20, 2008 | Computers & Internet

2 Answers

C000221


change the operating system cd try again change ur ram with any other ram from ur friends and try thats it ur probelm gets solevd in one of the cases try them gud luck

Apr 16, 2008 | Microsoft Windows XP Professional With...

1 Answer

Error


Hi, This is a known error and according to Microsoft could be caused by any of 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. This is better explained at http://support.microsoft.com/default.aspx?scid=kb;en-us;156669&Product=winxp Hardware side, replacing either the CD or the HD drive (or sometimes, the cable) in some instances would rectify the error. Hope this be of some help. Good luck and kind regards.

Oct 08, 2007 | PC Chips M981G Motherboard

1 Answer

Hard disk failure


Hi, assuming the hdd won't finish a format, it is possible that some sectors are damaged. If you still want to try and use the hdd even with these defects, you can try and partition the hdd. Guesstimate at what point the hdd stops responding and really guess where the defects end. With this info, partition the hdd into 3 with the middle containing the defective sectors. Format only the first and third partitions. For simplicity, Win98 might be easier to work with rather than XP. Hope this be of some help. Do post again and let us know how things turn up.

May 05, 2007 | Seagate Barracuda ATA IV (ST340016A) 40 GB...

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