Fix: ‘Class Not Registered’ Error on Windows 10

By: Milan Stanojevic
7 minute read

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We have all encountered an error on Windows 10, and speaking of errors, it seems that some users are having Class not registered error. As far as we know, this error can affect almost any software, and users have reported that Google Chrome isn’t working on Windows 10 due to this error. Google Chrome isn’t the only software affected by this issue, so let’s fix Class not registered error on Windows 10.

Class Not Registered Error On Windows 10 And How To Fix It?

Class not registered error message can cause various problems on your PC, and speaking of issues, many users reported the following problems as well:

  • Class not registered error when opening pictures, videos – According to users, this error message can appear while trying to open pictures or videos. If you have this problem, be sure to try out some of our solutions.
  • Class not registered Windows 10 Photos – This error can appear on any version of Windows, and many users reported it while trying to run Photos app.
  • Class not registered explorer.exe, Excel, regsvr32, Taskbar, uTorrent, Internet Explorer, Outlook, Microsoft Edge, Windows Media Player – Many users reported this error message while trying to run various applications. According to them, this error message can appear in Outlook, Edge, Internet Explorer, but it can also appear while using Windows Explorer.
  • Class not registered PDF – In several cases, users reported this error while trying to open PDF files. This can be an issue, but you should be able to fix it using one of our solutions.
  • Class not registered msstdfmt.dll – DLL files can sometimes cause this issue, and if you experience it on your PC, be sure to remove the application associated with that DLL file and check if that solves the problem.

How to solve Class not registered on Windows 10

Solution 1 – Disable iCloud

Some reports show that this issue is caused by iCloud, and in order to fix it, you need to close iCloud with Task Manager. You can do that by following these steps:

  1. Press Ctrl + Shift + Esc to start Task Manager.
  2. When Task Manager starts, find iCloud, right click it and choose End Task.
    Class not registered Windows 10 Photos

In addition, you can also disable iCloud from starting up by using Task Manager.

  1. Open Task Manager and go to Startup tab.
    Class not registered regsvr32
  2. Find iCould, right click it and choose Disable.
    Class not registered PDF

Solution 2 – Re-register ExplorerFrame.dll file

If Internet Explorer keeps crashing while giving you the Class not registered error, you might want to try the following:

  1. Open Command Prompt as administrator. To do that press Windows key + X and choose Command Prompt (Admin) from the menu.
    Class not registered PDF
  2. When Command Prompt starts, paste the following code and press Enter to run it:
    1. regsvr32 ExplorerFrame.dll
      Class not registered msstdfmt.dll

Solution 3 – Use Component Services

To run Component Services do the following:

  1. Press Windows Key + R and type dcomcnfg. Press Enter or click OK to run it.
    Class not registered error videos
  2. When Component Services window opens, go to Component Services > Computers > My Computer. Double click DCOM Config.
    Class not registered Internet Explorer
  3. You should get few warning messages. If that happens, just click Yes.
  4. Now close Component Services and restart your computer.

After doing that, this error message should stop appearing.


Solution 4 – Create a new Microsoft account

If there’s no other way to fix Class not registered error, you might want to create a new Microsoft account on Windows 10.

  1. Go to the Settings app. You can open Settings app quickly by using Windows Key + I shortcut.
  2. When Settings app opens, navigate to Accounts section.
    Class not registered msstdfmt.dll
  3. In the right pane, choose Family & other people from the menu on the left. In the right pane, click on Add someone else on this PC.
    Class not registered error when opening pictures
  4. Enter your Microsoft account email and click Next.
    Class not registered Windows 10 Photos
  5. Log out of your current account and switch to a new one.

We have to mention that this solution might not work unless you choose to sign in with a local account instead. To switch to the local account, follow these steps:

  1. Open Settings > Accounts.
  2. Click Sign in with a local account instead. You’ll be asked to enter your password.
    Class not registered Taskbar
  3. After doing that, you’ll have to enter username and password for your local account.
  4. Click Sign out and finish button. Now log back to your account.

After you’ve switched to a local account, repeat the steps from the beginning of this solution.


Solution 5 – Check your hard drive

In some rare cases, Class not registered error can be caused by a faulty hard drive, so make sure that your hard drive is working properly. Few users have reported that replacing their hard drive has fixed this issue for them.

If you’re still having issues with your hardware or you simply want to avoid them for the future, we recommend you to download this tool (100% safe and tested by us) to fix various PC problems, such as hardware failure, but also file loss and malware.


Fix – Class not registered error in Edge

Solution 1 – Set Edge / Internet Explorer as default browser

It has been reported that Class not registered error appears when users are searching the web using Cortana, and in order to fix this, you need to set Edge as a default browser. To do that, follow these instructions:

  1. Press Windows Key + S and type control panel. Choose Control Panel from the list of results.
    Class not registered PDF

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    3. Click “Repair All” to fix all issues with Patended Technologies (requires upgrade).

  3. Control Panel window will now appear. Select Default Programs from the list.
    Class not registered msstdfmt.dll
  4. When Default Programs window opens, select Set your default programs.
    Class not registered error when opening pictures
  5. Navigate to Web browser section and click on your browser.
    Class not registered Microsoft Edge
  6. Select Microsoft Edge from the list.
    Class not registered error when opening pictures

Some users have reported that they are unable to open anything on their desktop, and to fix this it’s advised to set Internet Explorer as the default browser. You can do that by following the steps that we described above, or by following these steps:

  1. Open Settings app and go to Apps section.
    Class not registered Windows 10 Photos
  2. From the pane on the left select Default apps.
  3. Go to Web browser section set Internet Explorer as the default browser.

After setting Internet Explorer or Microsoft Edge as the default browser, the problem should be completely resolved.


Solution 2 – Check if Internet Explorer ETW Collector Service is running

Class not registered error often affects Internet Explorer and Microsoft Edge, so if you’re having this problem with these browsers, try the following:

  1. Press Windows Key + R to open the Run dialog. Now enter services.msc and press Enter or click OK.
    Class not registered msstdfmt.dll
  2. In the list of services find Internet Explorer ETW Collector Service, right click it and choose Start.
    Class not registered error when opening pictures

Once you start this service, the problem should be completely resolved.


Fix – Class not registered explorer.exe Windows 10 error

Solution – Restart explorer.exe

If you have problems with Edge, Cortana or Start menu, it’s advised that you try restarting explorer.exe. To restart explorer.exe do the following:

  1. Start Task Manager and go to Details tab.
    Class not registered explorer.exe
  2. Find explorer.exe and right click it. Choose End Task from the menu.
    Class not registered PDF
  3. Now in Task Manager go to File > Run new task.
    Class not registered msstdfmt.dll – DLL files can sometimes cause this issue, and if you experience it on your PC, be sure t
  4. Create new task window will appear. Type explorer and press Enter or click OK.
    Class not registered error when opening videos
  5. Explorer will start again, and everything should be working.

Fix – “Class not registered” error with .jpg files on Windows 10

Solution 1 – Change default image viewer to Windows Photo Viewer

As we already mentioned “Class not registered” error can appear when you try to view .jpg files, and if this happens, you might want to set your default image viewer to Windows Photo Viewer. To do that, follow these simple instructions:

  1. Download and run this file.It’s a .reg file that will change your registry and enable Windows Photo Viewer on your computer.
  2. Find any picture on your computer and right click it.
  3. From the menu choose Open with > Choose another app.
    Class not registered Windows 10 Photos
  4. Select Windows Photo Viewer from the list. If you want to use only Windows Photo Viewer to view pictures, make sure that you select Always use this app to open .jpg files. Click OK to save changes.
    Class not registered Excel

If you don’t want to add any changes to your registry, you can simply download any free image viewing software, install it on your computer and repeat all steps starting from Step 2.


Solution 2 – Reset default apps

According to users, “Class not registered” error appears when they try to open a .jpg file on their computer, and this problem can be fixed by resetting default apps. To do that, follow these instructions:

  1. Open Settings > Apps > Default apps.
  2. Scroll down until you see Reset to the Microsoft recommended defaults. Click the Reset button.
    Class not registered PDF

Class not registered error can cause all sorts of problems on your computer, but we hope that our solutions have fixed this problem for you.


Editor’s Note: This post was originally published in February 2016 and has been since completely revamped and updated for freshness, accuracy, and comprehensiveness.


READ ALSO:

For various PC problems, we recommend this tool.

This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues now in 3 easy steps:

  1. Download this PC Repair Tool rated "Excellent" on TrustPilot.com.
  2. Click “Start Scan” to find Windows issues that could be causing PC problems.
  3. Click “Repair All” to fix all issues with Patended Technologies (requires upgrade).

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