Office Error 401 Fix

## Direct Answer
To fix Office error 401, try resetting your Microsoft Office credentials by going to the Microsoft Account website, signing in, and then restarting your Office application. If that doesn’t work, follow the step-by-step guide below.

## Step-by-Step Guide
1. **Check your internet connection**: Ensure your internet connection is stable and working properly.
2. **Clear Office cache**: Close all Office applications, press the Windows key + R, type `%localappdata%\Microsoft\Office\16.0\Wef` (or `15.0` if you’re using an older version), and delete the `Wef` folder.
3. **Reset Microsoft Office credentials**: Go to the Microsoft Account website, sign in with your account, and update your password if necessary.
4. **Disable and re-enable Office**: Go to the Control Panel, click on “Programs and Features” (or “Uninstall a program”), find Microsoft Office, right-click on it, and select “Change”. Then, click on “Repair” and follow the prompts.
5. **Reinstall Office**: If all else fails, try uninstalling and reinstalling Microsoft Office.

## FAQ
### Q: What is Office error 401?
A: Office error 401 is an authentication error that occurs when Microsoft Office is unable to verify your account credentials.
### Q: Why do I get Office error 401?
A: You may get Office error 401 due to incorrect or outdated account credentials, unstable internet connection, or corrupted Office files.
### Q: Will resetting my Microsoft Office credentials affect my files?
A: No, resetting your Microsoft Office credentials will not affect your files or documents. It will only update your account information and fix the authentication error.