When trying to start a Microsoft 365 app, you might get this error. Here are some things you can try to fix the problem. We've listed the most common solutions first, so try them in order.
Restart your device
Wait a few minutes, restart your device, sign back in, and restart your app.
Repair Office or Microsoft 365 from the Control Panel
How you get to the repair tool depends on your operating system.
Repair options from the Settings page
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Select Start > Settings > Apps > Apps & features.
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Select the More icon next to the app you want to fix.
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Select the Advanced options link under the name of the app (some apps don't have this option). On the page that opens, select Repair if it's available. If it isn't available or doesn't fix the problem, select Reset.
Repair options from the Control Panel
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In the search box on the taskbar, type control panel and select Control Panel from the results.
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Select Programs > Programs and Features.
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Right-click the program you want to fix and select Repair, or if that's not available, select Change. Then follow the directions on the screen.
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Right-click the Start button
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Select the Microsoft Office product you want to repair and select Modify. If you don't see any options, select the three dots on the right side.
Note: This will repair the entire Office suite even if it's just one application you want to repair such as Word or Excel. If you have a standalone app installed, then search for that application by name.
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Depending on if your copy of Office is Click-to-run or MSI-based install, you'll see the following options to proceed with the repair. Follow the steps for your installation type.
Click-to-run
In the window How would you like to repair your Office Programs, select Online Repair > Repair to make sure everything gets fixed. (The faster Quick Repair option is also available, but it only detects and then replaces corrupted files.)
MSI-based
In Change your installation, select Repair and then click Continue.
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Follow the instructions on the screen to complete the repair.
Uninstall and reinstall Office or Microsoft 365
Use the uninstall troubleshooter to uninstall Microsoft 365, Office 2021, Office 2019, or Office 2016 from your Windows PC.
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Select the button below to start the uninstall troubleshooter.
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Click Open if you get a pop-up window indicating This site is trying to open Get Help.
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Follow the prompts on the remaining screens and when prompted, restart your computer.
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Select the steps for the version of Office you want to install or reinstall.
Microsoft 365 | Office 2024 | Office 2021 | Office 2019 | Office 2016
Important:
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The uninstall troubleshooter currently can't uninstall Office 2024.
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Run the troubleshooter on the same Windows PC with the Microsoft 365 or Office product you want to uninstall.
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You need to be on Windows 10 or higher to run the troubleshooter.
Tip: If the Microsoft 365 uninstall troubleshooter doesn't completely uninstall Microsoft 365 or Office from your PC, you can try to manually uninstall Office.
Having trouble installing Office or Microsoft 365? Use the offline installer
To reinstall Microsoft 365 see Install or reinstall Office on a PC.
The Microsoft 365 offline installer may help bypass potential proxy, firewall, antivirus, or Internet connection issues that might occur during an Microsoft 365 installation.
For steps to install an offline version of Microsoft 365, see Use the Office offline installer and select the correct tab for your version of Office.
