Run a full Online Repair of Microsoft 365 rather than using Repair Now in the Word error dialog.
1. Repair Microsoft 365
Close Word and all other Office applications, then:
Windows 11
- Right-click Start and select Installed apps.
- Find Microsoft 365 or Microsoft Office.
- Select the three dots beside it, then Modify.
- Select Online Repair → Repair.
- Follow the prompts, restart Windows if requested, and open Word again.
Windows 10
- Right-click Start and select Apps and Features.
- Select Microsoft 365 or Microsoft Office, then Modify.
- Select Online Repair → Repair.
- Complete the repair and reopen Word.
Online Repair is the more thorough option; it repairs the entire Office suite even when only Word is affected. If the installation is MSI-based and Online Repair is not offered, select Repair and then Continue instead.^1^
2. If Word still displays the error
Test Word without automatically loading add-ins, global templates, or its normal settings:
- Press Windows key + R.
- Enter:
winword /a
- Press Enter.
This test does not permanently change Word. If Word opens successfully this way, an add-in, template, or Word setting is likely involved.^2^
Disable add-ins individually:
- In Word, select File → Options → Add-ins.
- At the bottom, choose an add-in category under Manage, then select Go.
- Clear one add-in, select OK, and restart Word normally.
- Repeat until Word starts without the error.^3^
3. Last fallback: reset Word’s settings
Only consider this if Online Repair fails and Word opens with winword /a. Editing the registry incorrectly can damage Windows settings, so export the key before deleting it.
- Close every Office application.
- Search for and open Registry Editor.
- Go to:
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Word\Data
- Right-click Data → Export, and save it as
Wddata.reg.
- Right-click Data → Delete.
- Close Registry Editor and start Word.
Word recreates the key with default settings; customized Word options and the recent-document list may be reset. If this does not help, close Office and double-click the exported Wddata.reg file to restore the original key.^2^
References
- Repair an Office application | Microsoft Support
- How to troubleshoot problems that occur when you start or use Word | Microsoft Support
- Word is not working. - Microsoft Q&A