How to Troubleshoot Office 365 Error Code 0x426-0x0

Microsoft Office error 0x426-0x0 is an error code that pops up when one of the programs from the Office Suite fails to launch. This error is prevalent for Outlook but it can affect other Office apps as well. Error 0x426-0x0 usually occurs when users try to launch Outlook, Excel, Word, or PowerPoint.

Troubleshooting this error usually takes some time as oftentimes the built-in Office repair feature fails to complete the repair process.

So, if you can’t always rely on the Repair feature, let’s see what else you can do to get rid of error 0x426-0x0.

How To Fix Office 365 Error 0x426-0x0

1. Repair Office

If you’re a lucky user, the Repair feature might work for you and it could successfully solve your problem.

1. Open the Control Panel
2. Go to Programs
3. Select Programs and features
4. Select Office 365 or Microsoft 365
5. Click Change
6. Select Repair and then Quick repair.

As stated at the beginning of this guide, the Office Repair option does not always work. If that’s the case for you as well, go to the next solution.

2. End all Office-related processes

If there are any Office processes running in the background from an earlier point of your current Windows 10 session, some of them might block new Office apps from launching resulting in error 0x426-0x0 popping on the screen.

The solution is to launch the Task Manager and end all the Office-related processes running in the background.

Click on the Processes tab to get the list of all the active processes. Simply right-click on the Office processes and select End Task.

After you’ve done all that, launch the problematic Office app again and check if error 0x426-0x0 persists.

3. Set Microsoft Click-to-Run to automatic

Ensure the Microsoft Click-to-Run service is up and running and set it to launch automatically. If the Microsoft Click-to-Run service somehow got disabled, you won’t be able to launch your Office apps.

Here are the steps to follow:

1. Go to Start and type services.msc
2. Double-click the first result to open the Services app
3. Locate the Microsoft Click-to-Run service and make sure it’s running
4. If the service is not running, right-click on it and select Properties
5. Go to Startup type and set it to Automatic
6. Reboot your computer if necessary and try to launch your Office apps again.

4. Uninstall Office

As a last resort, you can uninstall and then re-install Office. Don’t forget to backup your files first.

1. Go to Control Panel
2. Navigate to Programs → Programs and Features
3. Select Office 365 or Microsoft 365
4. Click the Uninstall button.

You also need to make sure all the Office files have been deleted:

1. Go to Start, type %ProgramFiles% and hit Enter
2. Locate and delete the following folders: Microsoft Office and Microsoft Office [version number]
3. Now, go back to Start and type %ProgramFiles(x86)%
4. Remove the Microsoft Office folder stored there (if there is one)
5. Open the Registry Editor and delete these subkeys:
   • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun
   • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\AppVISV
   • HKEY_CURRENT_USER\Software\Microsoft\Office
     • Some of these subkeys may not be visible on your computer. Remove only the ones present on your machine.
6. Remove all the Office shortcuts
7. You can now download and install Microsoft Office again.

There you go, we hope error 0x426-0x0 is history now and you can use your Office 365 apps without any problems.