Run an Online Repair of Microsoft 365 or Office; this is the most directly supported fix for this exact Word error on Windows.^1^
Repair Office
Close Word and all other Office applications first.
Windows 11
- Right-click Start and select Installed apps.
- Find Microsoft 365 or Microsoft Office.
- Select the three-dot menu next to it, and then select Modify.
- Select Online Repair > Repair.
- Complete the prompts, restart Windows if requested, and test Word.
Windows 10
- Right-click Start and select Apps and Features.
- Select Microsoft 365 or Microsoft Office, and then select Modify.
- Select Online Repair > Repair.
- Complete the repair and test Word.
Online Repair repairs the entire Office suite, even when only Word is affected. For an MSI-based Office installation, select Repair and then Continue instead.^2^
If Word still fails
Test whether an add-in or Word customization is involved:
- Press Windows+R.
- Enter:
winword /safe
- Press Enter.
If Word opens in Safe Mode:
- Select File > Options > Add-Ins.
- At the bottom, select an add-in category under Manage, such as COM Add-ins, and select Go.
- Clear one add-in, select OK, and restart Word normally.
- Repeat until Word starts successfully. The last disabled add-in is the likely incompatible one; leave it disabled or obtain an updated version.
If Word does not open in Safe Mode, the issue is not likely to be an add-in. Install Office updates from another working Office application under File > Account > Update Options > Update Now. If no Office application opens, run Windows Settings > Windows Update > Check for updates.^3^
If Online Repair, Safe Mode, and updates do not resolve it, the supported next step is to uninstall Office with Microsoft’s uninstall troubleshooter and reinstall it.^3^
References
- How to fix MS Word has run into an error that is preventing from working properly. Word will need to be closed as a result. - Microsoft Q&A
- Repair an Office application | Microsoft Support
- I get a "stopped working" error when I start Office applications on my PC | Microsoft Support