Run a full Online Repair from Windows Settings, because the Repair Now button in the error window may only perform a quick repair and has not resolved the suite-wide problem.
1. Run Online Repair
Close Word, Excel, PowerPoint, and any repair dialog that is still open.
Windows 11
- Right-click Start → Installed apps.
- Find Microsoft 365 or Microsoft Office.
- Select the three dots → Modify.
- Select Online Repair → Repair.
- Complete the prompts, restart Windows, and test Word, Excel, and PowerPoint.
Windows 10
- Right-click Start → Apps and Features.
- Select Microsoft 365 or Microsoft Office → Modify.
- Select Online Repair → Repair.
- Complete the repair and restart Windows.
Online Repair applies to the complete Office suite, so it repairs Word, Excel, and PowerPoint together. If an MSI-based installation displays Repair rather than Online Repair, select Repair → Continue.^1^
2. If the applications still fail, test Safe Mode
Safe Mode starts an Office application without its normal add-ins.
- Press Windows key + R.
- Test each command separately:
- Word:
winword /safe
- Excel:
excel /safe
- PowerPoint:
powerpnt /safe
- If an application opens in Safe Mode:
- Select File → Options → Add-ins.
- At Manage, select COM Add-ins → Go.
- Disable one add-in at a time, restart the application normally, and identify the problematic add-in.
- Update or remove that add-in.
If the applications do not open in Safe Mode, add-ins are not the likely issue; proceed to reinstalling Office.^2^
3. If Online Repair and Safe Mode do not work, reinstall Office
Uninstalling Office removes the applications but does not delete Word documents, Excel workbooks, or other files created with them.^3^
- Make sure the Microsoft account or work/school account associated with the Office license is available.
- Use Microsoft’s uninstall troubleshooter on the affected computer.
- Follow its prompts and restart Windows when requested.
- Sign in to the Microsoft 365 Apps page with the account associated with Office.
- Select Install apps, run the downloaded setup, and wait for “You’re all set! Office is installed now.”
- Open Word and complete activation if prompted.^4^
The uninstall troubleshooter requires Windows 10 or later and currently cannot remove Office 2024. For Office 2024, use the documented uninstall method for its installation type instead.^3^
If the failure remains after reinstalling, record the exact error message or error code shown when opening Word, Excel, or PowerPoint; that will distinguish an installation problem from activation, Windows, or device-driver issues.
References
- [Windows 11](https://support.microsoft.com/office/lifecycle/repair-an-office-application)
- I get a "stopped working" error when I start Office applications on my PC | Microsoft Support
- [Click-to-Run](https://support.microsoft.com/office/lifecycle/officeinstall/uninstall-microsoft-365-or-office-from-a-pc)
- Download, install, or reinstall Microsoft 365 or Office 2024 on a PC or Mac