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How to Repair STOP: C0000221 ntdll.dll Error
What is ntdll.dll?
The ntdll.dll is a native API file of the Microsoft OS and is responsible for NT kernel functions. This file is an important component of the Windows OS and depending on your version of Windows it can be found at the following locations:
- C:\winnt\system32\
- C:\windows\system32\
- C:\i386\
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Ntdll.dll Error Description
Ntdll.dll errors are normally the result of an unknown hard drive error. When this error occurs your computer may become non-responsive or crash. An error in ntdll.dll often affects Internet Explorer 7 and Windows Explorer, causing your computer to become very slow and difficult to work with.
Listed below are the most common error messages you may be presented if you have an ntdll.dll error:
STOP: C0000221 Unknown Hard Error \SystemRoot\System32\ntdll.dll
STOP: C0000221 unknown hard error Path\File_name
STOP: 0xC0000221 unknown hard errorC:\Winnt\System32\Ntdll.dll (or another specific file or driver)
STOP: 0xC0000221 STATUS_IMAGE_CHECKSUM_MISMATCHPath\File_name
Troubleshooting and Solutions to ntdll.dll Hard Error
Below are listed ways to troubleshoot and resolve issues generating an ntdll.dll error message.
Malfunctioning Hard Drive. Ntdll.dll may also be caused if there is a problem with the cable that connects your hard drive to the motherboard of your computer. To determine if this is the cause of the error try to connect your hard drive to another cable of the same type. Other devices that use the same cables are; CD, DVD and Zip drives.
If this resolves the issue you will need to purchase a new cable for your hard drive to permanently repair the issue.
Faulty Windows Installation. If you are experiencing a ntdll.dll error right after installing Windows, you will need to see if the installation is not damaged. It is possible to complete the installation of Windows using a damaged disc, but it will only complicate things in the future and cause system errors as damaged files will be installed.
Also, if you installed an illegal copy or burned CD for the installation, it increases the chances of ntdll.dll errors so it always recommended to use a genuine copy of Windows during installation.
Outdated or Corrupted Drivers. Often, old and damaged drivers will cause various system errors, therefore it is always important to ensure all hardware devices connected to your computer are running on the latest drivers, it also important that these drivers are compatible with your Operating System and other hardware devices.
The easiest way to do this is by using a driver updater utility: Driver Checker will find the required drivers and install them automatically.
Click here to download Driver Checker
Damaged or Corrupt Registry. You may also experience ntdll.dll if files in your registry become corrupt or missing. To prevent such situations from occurring and keep a healthy and error free computer it is advised to install and perform regular registry maintenance using a registry cleaning tool.
Reggenie offers a free scan you can use to determine if your computer has any system related errors. Click here to download and scan your computer