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Fix Microsoft 365 Apps Showing an Error and Closing (Repair Not Working)
Question details
The user is unable to use Microsoft 365 because every application shows an error stating it must close, and the built-in repair button triggers no action.
- Product
- Microsoft 365
- Device & OS
- Windows PC
- Scenario
- Attempting to launch and use any Microsoft 365 application (such as Word, Excel, or PowerPoint) on a laptop.
- Observed behavior
- The applications instantly display an error message forcing them to close, and clicking the on-screen repair option fails to initiate any troubleshooting or repair process.
Before proceeding with a full online repair or uninstallation, save any locally stored work and securely back up your Outlook data files (.pst or .ost) to prevent email data loss.
Perform an Online Repair via Windows Settings
Use the comprehensive Online Repair tool built into Windows Settings, which replaces corrupted files rather than relying on the in-app quick repair prompt.
The quick repair prompt that appears inside crashing Office apps often fails to execute if the core Office installation service is damaged. Running an Online Repair from the Windows settings will download a fresh set of Microsoft 365 installation files and reapply them to your system.
Right-click the Windows Start button and select 'Apps and Features' (or 'Installed apps' in Windows 11) from the context menu.
Scroll through the list of installed programs or use the search bar to find your Microsoft 365 installation.
Click on Microsoft 365 and select 'Modify'. If prompted by User Account Control (UAC) asking if you want the app to make changes to your device, select 'Yes'.
In the dialog box that appears, select 'Online Repair' instead of 'Quick Repair', then click the 'Repair' button and wait for the process to complete.
Completely Uninstall and Reinstall Microsoft 365
If Online Repair does not resolve the crash, deeply remove Microsoft 365 using the official uninstall support tool and perform a clean installation.
Use WPS Office When Microsoft 365 Apps Fail to Open
If your Microsoft 365 applications continue to crash and repair attempts fail, consider switching to WPS Office. It provides a lightweight, highly compatible, and free alternative that opens your existing Word, Excel, and PowerPoint files without the heavy installation footprint that often causes Microsoft 365 to fail.
- 1. Download the Installer: Visit the official WPS Office website and download the free, lightweight installer package.
- 2. Install WPS Office: Run the installer. The process is extremely fast and avoids the complex background services required by Microsoft 365.
- 3. Open Your Files Instantly: Launch WPS Office and directly open your existing Microsoft Office documents to continue your work without interruption.
Frequently Asked Questions
Why do my Microsoft 365 apps suddenly show an error and close?
This issue is typically caused by corrupted program files, conflicting third-party add-ins, or an incomplete Windows OS update that disrupts the background licensing or functionality services of Microsoft Office.
What is the difference between Quick Repair and Online Repair?
Quick Repair runs offline and rapidly replaces a few corrupted files without needing an internet connection. Online Repair completely uninstalls and redownloads the entire Office installation from Microsoft's servers, making it much more effective for severe crashing issues.
Will I lose my documents if I uninstall Microsoft 365 using the support tool?
No. Uninstalling the application suite will only remove the program files. Your personal documents, spreadsheets, and presentations saved on your hard drive or in OneDrive will remain completely safe. However, backing up local Outlook data (.pst) is highly recommended.
Why does the in-app repair button do nothing when clicked?
When the error dialog box pops up inside a crashing app, the underlying service responsible for triggering the repair task may also be corrupted or non-responsive. That is why initiating the repair manually from Windows 'Apps and Features' settings is necessary.
