How to Fix Help! Excel Does Not Open: Faulting Module Ntdll.dll

When Excel stops working as expected, start with the shortest official checks before you reinstall anything.

Problem Description: Help Excel Open Faulting

Help! Excel Does Not Open - Faulting Module Ntdll.dll is the issue affecting Excel. The displayed message is “Excel couldn't start last time. Safe mode could help you troubleshoot the problem . . . Do you want to start in safe mode?”. The issue occurs in a Windows 10 desktop computer.

Quick Answer for Excel Setup on New Device

Excel problems are commonly caused by add-ins, damaged preferences or templates, outdated builds, unavailable resources, or a corrupted installation. Start with low-risk tests before applying a broader repair.

Likely Causes Behind Office Apps Not Opening Root Factors

• The Microsoft account or license context may not match the purchase or device.

• Cached credentials, outdated builds, or damaged local components can trigger office apps not opening.

• A file-specific corruption or add-in conflict can mimic a broader application failure.

Recommended Solution: Transferring Excel License Safely

When to use this: Apply these steps when the symptoms match and you can access the relevant Microsoft account or administrator.

1. Reinstall ntdll.dll.

2. Open Terminal (Admin) or Windows PowerShell(Admin) (Press Windows key + X then click Terminal(Admin)).

3. Select Download Now, and select Run.

4. Record the exact behavior, error message, Excel version, operating system, and affected scope.

5. Test the same action in a private browser window, a new blank file, or the web version of Excel to separate account, file, and local-app causes.

6. Update Excel, restart the device, and retry with nonessential add-ins or extensions disabled.

Alternative Solutions for Secondary Office Fixes

1. Retry the Microsoft-side steps after restarting the app and device.

2. Test the same action in a private browser session or a new blank file to isolate account vs file issues.

3. Run Quick Repair, then Online Repair from Programs and Features if the app still fails.

4. Capture exact error text and screenshots before contacting Microsoft Support or your administrator.

Working with WPS Office: WPS as a Local Alternative

WPS Office cannot replace Microsoft account, activation, or cloud fixes for this scenario. It remains one of the best free Microsoft Office-compatible alternatives for opening and editing local files.

1. Download and install WPS Office from the official website.

2. Open local Word, Excel, PowerPoint, or PDF files in the matching WPS app.

3. Save a working copy locally while Microsoft-side issues are resolved.

4. Return to Microsoft Office after the primary fix succeeds.

If you need a practical local workspace in the meantime, try WPS Office.

Prevention Tips for Keeping Excel Stable Long Term

• Keep one primary Microsoft account for subscriptions and Office sign-in.

• Install updates for Office and Windows before retrying failed workflows.

• Back up important files before repair, reset, or reinstall actions.

• Document exact error messages before the next troubleshooting attempt.

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FAQs About Excel Support Questions

Can WPS Office fix this office apps not opening issue directly? Only when the WPS steps match the formatting or file task. Account, activation, and cloud issues stay on the Microsoft side.

Should I reinstall Excel before trying these steps? Not first. Confirm account, license, and the exact error before reinstalling.

What should I send to Microsoft Support? The affected account email, device type, Office version, exact error text, and screenshots with personal data hidden.