A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Run an Online Repair from Windows Settings rather than relying only on the Repair Now button in Excel’s error dialog.
Repair Microsoft 365 or Office
- Close Excel and every other Office application.
- Open the repair settings:
- Windows 11: Right-click Start → Installed apps.
- Windows 10: Right-click Start → Apps and Features.
- Find Microsoft 365 or Microsoft Office.
- Select the three dots (if shown) → Modify.
- For a Click-to-Run installation, select Online Repair → Repair.
- If the installer instead displays Change your installation, select Repair → Continue.
- Complete the process, restart Windows, and test Excel.
Online Repair repairs the entire Office suite, even when only Excel is affected. It is more comprehensive than Quick Repair, which only detects and replaces corrupted files.^1^
If Excel still displays the error
Test whether an add-in is preventing Excel from starting:
- Press Windows key + R.
- Enter:
excel /safe - Select OK.
- If Excel opens successfully, go to File → Options → Add-ins.
- At the bottom, select COM Add-ins under Manage, then select Go.
- Clear every checkbox and restart Excel normally.
- If Excel now works, enable the add-ins individually, restarting Excel after each one, to identify the conflicting add-in.^2^
If Excel does not open in Safe Mode and Online Repair does not resolve it, uninstall and reinstall Microsoft 365 or Office. Microsoft’s startup-error procedure lists reinstallation as the next recovery option after repair.^3^
References