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Download and install Windows 0xc000021a repair tool.

Last Updated :Wednesday, January 22, 2020

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Operating System: Windows 8, Windows 7, Vista, XP
Downloads: 3,281,199
Release Date: July 22, 2015

Recommended Steps To Fix Error 0xc000021a

Step 1: Click here to begin Downloading Regcure Pro
Step 2: Run Scan to identify all errors
Step 3: Click “Fix All”!

NB: Once you select Fix All, your Windows Registry will be repaired automatically by Regcure Pro. It will identify and remove any Windows registry entries that are causing errors including 0xc000021a.

It will do this in less than 2 minutes depending on how many other errors it finds in the same scan process.

What Is Error Code 0xc000021a?

For the most part, PC’s tend to take care of themselves. They help you to go about your normal day to day duties, however, like anything, they too need maintenance to ensure they are running smoothly.

Error code’s such as 0xc000021a are symptoms of Window registry errors that need to be taken care of.

Unfortunately, for most PC users, finding and correcting these errors can be a laborious task and if executed incorrectly can cause major issues that may render your PC useless.

Why Does Error 0xc000021a Happen?

Error code’s like 0xc000021a occur mostly from software programs that do not clear their registry setting correctly when a program is uninstalled by a user.

These programs can be anything from screensavers, PC games etc etc. These errors can cause Windows to become overloaded due to invalid system references, corrupted and inadequate clearing of registry entries.

One rogue entry may not even be noticeable, however over time, you may notice your PC slowing down in speed and if you observe it progressively getting slower then, you may have several hundred invalid entries.

Finding each individual rogue entry and fixing them can be difficult if you don’t know what to look for and how to fix it. Deleting the wrong entry can cause your PC to become inoperable. Therefore it is best to either leave this kind of repair to a professional technician or software program specifically designed to fix any error automatically like Regcure Pro.

download recommended repair tool to resolve Windows 0xc000021a error code.

Manual Registry Error Fix

Windows Registry Checker automatically scans the system registry for invalid entries and empty data blocks when it is started.

If invalid registry entries are detected, Windows Registry Checker automatically restores a previous day’s backup. This is equivalent to running the scanreg /autorun command from a command prompt. If no backups are available, Windows Registry Checker tries to make repairs to the registry.

This is equivalent to running the scanreg /fix command from a command prompt. If the registry contains more than 500 KB of empty data blocks, Windows Registry Checker automatically optimizes it.

Windows Setup runs the Windows Registry Checker tool to verify the integrity of the existing registry before it performs an upgrade. If it detects registry damage, it tries to fix it automatically.

The protected-mode version of the Windows Registry Checker tool (Scanregw.exe) can create a backup of the system files and scan the registry for invalid entries.

If invalid entries are detected, it refers to the real-mode version of the Windows Registry Checker tool (Scanreg.exe) for a resolution.

You can configure Windows Registry Checker with a Scanreg.ini file. Settings that you can configure include:

  • Enabling or disabling the tool
  • The number of backups maintained (no more than five is recommended)
  • The location of the backup folder
  • Settings to add additional files to the backup set

For additional information about the Scanreg.ini file, click the article number below to view the article in the Microsoft Knowledge Base:

183603 How to Customize Registry Checker Tool Settings

To start the Windows Registry Checker tool, click Start, click Run, type scanregw.exe in the Open box, and then click OK.

NOTE: To use the Windows Registry Checker tool with the /restore parameter, you must run the tool from a command prompt running outside of Windows. When you do so, you can choose up to five registry backup files listed for you to restore.

To Restore Individual Files

To restore individual files, follow these steps:

  1. Click Start, point to Find, and then click Files Or Folders.
  2. In the Named box, type rb0*.cab, and then click Find Now.
  3. Double-click the cabinet file that contains the file that you want to restore.
  4. Right-click the file that you want to restore, click Extract, and then choose the folder where the new file is to be placed. Microsoft recommends that you place the file in your Temp folder.
  5. Restart your computer in MS-DOS mode (in Windows Millennium Edition, this requires that you restart with the Windows Millennium Edition Startup disk).
  6. Copy the file that you extracted to the appropriate folder. Note that registry .dat files are typically marked as hidden and read-only, so you need to use both the attrib and copy commands to replace the existing file with the newly extracted one.

Known Issues for Windows Registry Checker

If your registry contains an entry that references a file (such as a .vxd file) that no longer exists, it is not repaired by Windows Registry Checker. Such errors are not typically damaging, and you can manually remove the entry.

For additional information about such errors, click the article number below to view the article in the Microsoft Knowledge Base:

132008 Err Msg: Cannot Find a Device File That May Be Needed…

The amount of conventional memory that is required by Windows Registry Checker is determined by the size of your registry. Windows Registry Checker may require 580 KB or more of free conventional memory to complete the repair process.

If you encounter an “Out of Memory” error message, optimize your free conventional memory.

For additional information about optimizing memory, click the article number below to view the article in the Microsoft Knowledge Base:

134399 How to Increase Conventional Memory for MS-DOS-Based Programs

NOTE: Extended memory is required for Windows Registry Checker to operate properly, so it does not run when you start your computer with the Safe Mode Command Prompt Only option.

The exception to this is the scanreg /restore command, which is the only Scanreg function that can run without extended memory memory.

Common Error Code Fixes:


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