Fixing the "Class Not Registered" Error in Windows 10

The "Class Not Registered" error in Windows 10 can appear in various scenarios, such as when launching apps, opening files, or using system tools. This issue is generally due to broken file associations or incorrect registration of system libraries, which can disrupt the functionality of certain programs. This guide will explore the causes behind this error and provide effective solutions.

What Causes the "Class Not Registered" Error?

This error usually points to issues with specific system components. Common causes include:

  • System library issues: Some Windows libraries may be corrupted or missing, leading to errors.
  • Broken file associations: Files may lose their connection to the appropriate application needed to open them.
  • Improper registration of system components: Some apps might improperly register components, resulting in conflicts.

How to Fix the "Class Not Registered" Error

1. Re-register System Libraries with regsvr32 Command

One of the most effective ways to fix this issue is by re-registering libraries essential for Windows operations. Here’s how:

  1. Open the Command Prompt as an administrator. Press Win + S, type cmd, right-click on Command Prompt, and select "Run as administrator."
  2. Type the following command to re-register the ExplorerFrame.dll library:
regsvr32 ExplorerFrame.dll

Press Enter and restart your computer once the command completes.

2. Reset File Associations

The issue may also be due to incorrect file associations, for instance, with browsers or other applications. Follow these steps to fix it:

  1. Go to Settings → Apps → Default Apps.
  2. Manually set default applications for each file type or protocol as needed.
  3. Alternatively, you can reset all associations by clicking "Reset" under the settings section.

3. Check System File Integrity with SFC and DISM

System file errors can be fixed with the built-in SFC and DISM tools:

  1. Open the Command Prompt as an administrator.
  2. Enter the following command to check file integrity:
sfc /scannow

After the scan finishes, restart your computer. If the error persists, run the following command:

DISM /Online /Cleanup-Image /RestoreHealth

This command will repair any corrupted system components.

4. Re-register Microsoft Store Apps

If the error occurs when running Microsoft Store apps, try re-registering them:

  1. Open PowerShell as an administrator.
  2. Enter the following command:
Get-AppxPackage -allusers | foreach {Add-AppxPackage -register "$($_.InstallLocation)\appxmanifest.xml" -DisableDevelopmentMode}

This command will re-register all Microsoft Store apps on your system.