how to repair the not working condition and not open the app

Run Online Repair from Windows Settings rather than using the Repair Now button in the Excel error window.

Repair Microsoft Office

1. Close Excel, Word, Outlook, and all other Office applications.
2. Open the repair screen:
   • Windows 11: Right-click Start → Installed apps.
   • Windows 10: Right-click Start → Apps and Features.
3. Find Microsoft 365 or Microsoft Office.
4. Select the three dots → Modify.
5. Choose Online Repair → Repair.
   • If the installation is MSI-based and Online Repair is not offered, choose Repair → Continue.
6. Complete the on-screen process, restart Windows, and then open Excel.

This repairs the entire Office installation even when only Excel is affected. Online Repair is more comprehensive than Quick Repair, which only detects and replaces corrupted files.^1^

If Excel still will not open

Test whether an add-in is blocking startup:

1. Press Windows + R.
2. Enter:

      excel /safe
   

3. Select OK.
4. If Excel opens, go to File → Options → Add-ins.
5. At the bottom, select COM Add-ins from Manage, then select Go.
6. Clear all add-in checkboxes and restart Excel normally.
7. If Excel now works, enable the add-ins one at a time, restarting Excel after each one, to identify the problematic add-in.

Safe mode bypasses Excel add-ins, most COM add-ins, startup folders, and certain customized settings.^2^

If Online Repair and safe mode both fail

Uninstall and reinstall Microsoft 365 or Office:

1. Confirm that the Office license or Microsoft 365 subscription is associated with the Microsoft account used for installation.
2. Use Microsoft’s uninstall troubleshooter on the affected PC.
3. Restart Windows when prompted.
4. Reinstall the same licensed Office edition and open Excel again.

The uninstall troubleshooter requires Windows 10 or later and currently cannot uninstall Office 2024.^3^

If the error remains, provide the Windows version, Office edition, and whether Word or other Office applications show the same error. Those details distinguish an Excel-only add-in problem from an Office-wide installation problem.

References

1. Repair an Office application
2. Excel not responding, hangs, freezes or stops working
3. "Something went wrong" error when you try to start a Microsoft 365 app