Sorry, EXCEL encountered an error that prevented it from working properly, so EXCEL needs to be closed. Want us to fix it right away?

Miller Abby 20 Reputation points
2026-08-27T15:46:39.3633333+00:00

I'm sorry, but EXCEL encountered an error that prevented it from working properly, so you need to close EXCEL. Want us to fix it right away?

Open Exce and this will pop up, how to solve it.

Microsoft 365 and Office | Excel | For education | Windows
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Answer accepted by question author
BabybooHN 2,780 Reputation points Independent Advisor
2026-08-27T16:16:54.99+00:00

Dear @Miller Abby

I understand how frustrating it is to encounter the "Excel encountered an error that prevented it from working properly" prompt as soon as you open the application.

This error typically occurs when Microsoft 365 or Office activation credentials conflict, an corrupted add-in prevents startup, or the Office installation files require a repair.

Below are the recommended, step-by-step troubleshooting steps to resolve this issue:
Step 1: Open Excel in Safe Mode

Starting Excel in Safe Mode bypasses add-ins and custom settings to help determine if an add-in is causing the crash.

  • Press Windows Key + R to open the Run dialog box.
  • Type excel /safe and press Enter (note the space before /safe).
  • If Excel opens without any error, go to File > Options > Add-ins.
  • Select COM Add-ins from the Manage drop-down menu at the bottom and click Go.
  • Uncheck all active add-ins, click OK, and restart Excel normally to see if the issue is resolved. User's image

Step 2: Clear Office Activation Credentials

  • Stale or mismatched account sign-in details can trigger this startup prompt.
  • Close all Microsoft 365 applications.
  • Open Control Panel on your computer and navigate to User Accounts > Credential Manager.
  • Select Windows Credentials.
  • Under Generic Credentials, look for any entries starting with MicrosoftOffice16_Data or ADAL.
  • Expand each relevant entry and click Remove.
  • Open Excel again and sign in with your Microsoft 365 account credentials if prompted. User's image

Step 3: Run an Office Quick Repair

If the issue persists, running the built-in Microsoft Office repair utility will fix corrupted core installation files.

  • Right-click the Start button and select Installed apps (or Apps & features).
  • Scroll down and find Microsoft 365 (or your version of Microsoft Office).
  • Click the three dots next to it (or select it) and choose Modify.
  • Select Quick Repair and click Repair. Follow the on-screen instructions.
  • Once to check if the promptcomplete, launch Excel appears.

For more details on performing an Office repair, you can refer to the official Microsoft Support article on repairing an Office application.

Please give these steps a try and let me know how it goes. If the problem continues after trying these methods, feel free to reply with your Windows OS version so I can assist you further.

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  1. AI answer

    2026-08-27T15:46:53.9866667+00:00

    On Windows, this error is commonly caused by a damaged Office installation or a problematic add-in. Follow these steps in order:

    1. Update Office
      • Open any Office app.
      • Go to File > Account.
      • Under Product Information, select Update Options > Update Now.
      • If Update Now is not visible, select Enable Updates first.
    2. Start Excel in Safe Mode
      • Press Windows + R.
      • Type excel /safe and press Enter.
      • If Excel opens in Safe Mode, the issue is likely caused by an add-in.
    3. Disable add-ins
      • In Excel Safe Mode, go to File > Options > Add-Ins.
      • In the Manage list, select Excel Add-ins or COM Add-ins, then select Go.
      • Clear one add-in, select OK, and restart Excel normally.
      • Repeat until the problematic add-in is identified.
      • Older add-ins such as Abbyy FineReader, PowerWord, and Dragon Naturally Speaking are specifically called out as possible causes.
    4. Run Office repair
      • Close all Office apps.
      • Open Settings > Apps > Installed apps.
      • Find Microsoft 365 or Office.
      • Select the three dots > Modify.
      • Run Quick Repair first if available. If the problem continues, run Online Repair.
      • Online Repair reinstalls Office components and can take 15–30 minutes. Do not cancel it.
      • Restart the PC after the repair finishes.
    5. If all Office apps show the same error
      • Prefer Online Repair, because that is recommended when Excel, Word, Outlook, and other Office apps all fail the same way.

    If Excel does not start even in Safe Mode, the documented next step is to repair Office or uninstall and reinstall it.

    References:

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