Class not registered on Windows 10 [Solved]

By April Cai in Common Errors Tags: Windows 10

If you want to open an app or program on your Windows 10, but if fails, and you’re seeing this error saying: Class not registered. Reset assured, you’re not alone. Many Windows users encounter this error. More importantly, you can fix it easily by yourself.

This error occurs on your Windows 10 mainly due to the app or the program with unregistered DLL files. You can probably fix it by these following solutions:

Try one at a time:

  1. Fix DCOM(Distributed Component Object Model) errors
  2. Re-register ExplorerFrame.dll file
  3. Start Internet Explorer ETW Collector Service
  4. Set Windows Photo Viewer as a default image viewer 
  5. Disable iCloud

Fix 1: Fix DCOM(Distributed Component Object Model) errors

1) On your keyboard, press the Windows logo key + R key at the same time to invoke the run command.


2) Type dcomcnfg and press Enter to open Component Services.



2) Go to Component Services Computers My Computer on the Component Services window. Then double-click on DCOM Config.



3) Then a few DCOM Configuration warning messages will pop up. Click Yes for each one.



4) Reboot your Windows 10 and open the app again to see if it goes fine.

Fix 2: Re-register the ExplorerFrame.dll file



1) Press the Windows logo key  + X key together, then click Command Prompt(Admin).
Click Yes when prompted by User Account Control.



2) Type regsvr32 ExplorerFrame.dll in the command prompt window and press Enter to run it.



3) Open the app again to see if it goes fine.

Fix 3: Start the Internet Explorer ETW Collector Service

1) On your keyboard, press the Windows logo key + R key at the same time to invoke the run command.

2) Type services.msc in the box and press Enter to open Windows Services.



3) Find and right-click on Internet Explorer ETW Collector Service. Then click Start.



4) Open the app again to see if it goes fine.

Fix 4: Set Windows Photo Viewer as a default image viewer

Note: If Class not registered error occur when you open the photo app, try to set Windows Photo Viewer as a default image viewer to fix the error.

1) On your keyboard, press the Windows logo key key at the same time to open the Windows Setting window.

2) Click System.



3) Click Default apps on the left pane. Then on the right pane, scroll down to click Reset under the Reset to the Microsoft recommended defaults section.



4) Open the app again to see if it goes fine.

Note: If you’ve installed iCloud on your Windows 10, you can try the fix below if all the fixes above don’t help.

Fix 5: Disable iCloud

Some users reported that to disable iCloud in Task Manager fix the error for them. So make sure to try to disable icloud if you install one on Windows 10.

1) Press Shift + Ctrl + Esc keys at the same time to open Task Manager.

2) On Task Manager window, tap on the Startup pane. Then find and right-click on iCloud Services. Click Disable.



3) Open the app again to see if it goes fine.

That’s it!
Hopefully you have got your Windows 10 out of Class not registered error.


  • Pat

    I am having the same issue as you. Did you find an answer?

  • Mehran Abbas

    Restarting will fix this issue and after that you should upgrade to latest version of windows 10 and you will be good to go

  • praphull karne

    internet explorar etw collector file is not show .
    so what i do

  • MC2 Miller

    Tried all, Batting Zero!
    This is really amazing that Microsoft Windows 10 Pro could just loose a key component.
    And, that Microsoft has no clue that this is a problem. Seems many people have this issue.

    • Robert Miller

      rebooted and tried again, none of these apply or fix the problem.
      Why can’t Microsoft fix this?
      Worse – my computer reboots every 14 minutes.

  • Jamal Hayden

    none of the shortcuts are working and i cant even get the start menu up!

    • Jamal Hayden

      please help

      • April Cai

        Hi, Jamal Hayden. In such case, you could try to restart your computer and then try the solutions here. Sometimes, restarting can solve some wired computer problems as here you cannot get the start menu up.