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FIX: Explorer.exe class not registered [Win 10, Edge, JPG]


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 the steps above.


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 drives has fixed this issue for them.

That’s why we recommend you to use a high-quality hard drive, like the Seagate BarraCuda 2 TB, which provides 2000 GB of space along with a read-speed of 220 Megabytes per second.

This is a 3.5 inch SATA 6Gb/s HDD that also comes with a 7200 RPM that ensures a that your PC will run smoothly each time and a 256MB Cache of 3.5-Inch.

Seagate BarraCuda 2 TB

Seagate BarraCuda 2 TB

Looking for a great hard drive that keeps your device error-free? Rely on this excellent recommendation.

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6. Set Microsoft Edge as the default browser

  1. Press Windows Key + S and type control panel. Choose Control Panel from the list of results.Class not registered PDF
  2. Control Panel window will now appear. Select Default Programs from the list.Class not registered msstdfmt.dll
  3. When the Default Programs window opens, select Set your default programs.Class not registered error when opening pictures
  4. Navigate to the Web browser section and click on your browser.
  5. Select Microsoft Edge from the list.Class not registered error when opening pictures
  6. Open the Settings app and go to the Apps section.
  7. From the pane on the left select Default apps.
  8. Go to the Web browser section set Internet Explorer as the default browser

After setting Internet Explorer or Microsoft Edge as the default browser, the Class not registered explorer.exe problem should be completely resolved.


7. Check if Internet Explorer ETW Collector Service is running

  1. Press Windows Key + R to open the Run dialog. Now enter services.msc and 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.
  3. Start Task Manager and go to the Details tab.Class not registered explorer.exe
  4. Find explorer.exe and right-click it. Choose End Task from the menu.Class not registered PDF
  5. Now in Task Manager go to File, then click Run new task.
  6. Create new task window will appear. Type explorer and click OK.

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

After you complete this procedure, Explorer will start again, and everything should be working accordingly.


8. Change default image viewer to Windows Photo Viewer

  1. Find any picture on your computer and right-click it.
  2. From the menu choose Open with, click Choose another app.
  3. 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.

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.


Need more info on how to use Windows Photo Viewer on Windows 10? Check out this article.


9. Reset default apps

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

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:

If you can’t change the Windows default apps, check out this article that will help you do just that.


The Explorer.exe class not registered error can cause all sorts of problems on your computer, but we hope that our solutions have fixed this issue for you.

If you have any more questions, feel free to drop them in the comments section below.



This post was written by Milan Stanojevic and was first posted to WindowsReport

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