Start Word in Safe Mode so you can identify whether an add-in is causing the startup error, then run Microsoft 365 Online Repair if Word still cannot open.
1. Start Word in Safe Mode
- Press Windows key + R.
- Type:
winword /safe
- Select OK. Ensure there is a space before
/safe.
Safe Mode starts Word without loading add-ins and other startup customizations.^1^
- If Word opens: save or complete your homework, then proceed to the add-in steps below.
- If Word displays the same error: skip to Online Repair.
2. If Safe Mode works, disable the faulty add-in
While Word is open in Safe Mode:
- Select File → Options → Add-ins.
- At the bottom, set Manage to COM Add-ins, then select Go.
- Clear one add-in and select OK.
- Close Word and open it normally.
- If the error remains, repeat the process with the other add-ins until Word opens.
Leave the problematic add-in disabled, or install an updated version from its publisher. Microsoft specifically documents add-in isolation when Word starts in Safe Mode but fails during normal startup.^2^
3. If Safe Mode does not work, run Online Repair
Online Repair affects the entire Microsoft 365 installation, not only Word. Save work in any other Office applications first.
Windows 11
- Right-click Start and select Installed apps.
- Find Microsoft 365.
- Select the three dots → Modify.
- Select Online Repair → Repair.
- Follow the prompts, restart the computer if requested, and open Word again.
Windows 10
- Right-click Start and select Apps and Features.
- Select Microsoft 365 → Modify.
- Select Online Repair → Repair.
- Complete the repair and try Word again.
For this specific “Word has run into an error” message, Online Repair is the recommended full repair when Word cannot start correctly.^3^
4. If Online Repair fails
Uninstall Microsoft 365, restart the computer, and reinstall it from the Services & subscriptions page of the Microsoft account associated with the subscription. Uninstalling Office does not normally delete documents, but ensure important homework files are backed up before proceeding.^3^
References
- Open Office apps in safe mode on a Windows PC | Microsoft Support
- I get a "stopped working" error when I start Office applications on my PC | Microsoft Support
- we are sorry, but word has run into an error that is preventing it from working correctly. Word will need to be closed as a result. Would you like us to repair now? - Microsoft Q&A