How to Fix Error Installing Microsoft Office 2021/2019/365

Common Causes of Error Code 1603

• Old Office app already installed on the PC. If so, uninstall and reinstall the app.
• Installing the package to a folder that is encrypted.
• Lack of Full Control permissions for the SYSTEM User Account.
• Firewall or antivirus software blocking the Office installation.

Solution 1: Temporarily Disable Windows Defender

1. Click the Windows Start button and type Windows Security.
2. Open the Windows Security window and select Virus & Threat Protection.
3. Select Manage Settings under Virus & Threat Protection Settings.
4. Switch Real-time protection to Off.

How to Temporarily Disable Third-Party Antivirus Software

1. Open your antivirus application (e.g., McAfee, Norton, AVG).
2. Go to Settings and navigate to Real-Time Protection.
3. Turn off Real-Time Protection.
4. Disable the antivirus firewall by selecting Turn Off Antivirus Firewall.

Solution 2: SFC Scan to Fix Office Installation Errors

1. 1. Open the Command Prompt as an administrator.

1. Type the command SFC /SCANNOW and press Enter.
2. Wait for the scan to complete.

Note: If Windows indicates “Windows Resource Protection discovered corrupt files but was unable to fix some of them,” additional repairs may be necessary.

Solution 3: Remove and Reinstall Office

1. Download the Microsoft Support and Recovery Assistant utility.
2. Run the downloaded file SetupProd_OffScrub.exe.
3. Install the Microsoft Recovery Tool.
4. Once installation is complete, agree to the terms and conditions.
5. Wait until the Microsoft Support and Recovery Assistant troubleshooting process completes.
6. Select the checkbox for the Office product you wish to remove and click Next.

How to Install Office

1. Go to Office My Account and log in using your registered email ID and password.
2. Click on the Install option under your Office product.
3. Save the installer setup file and run it once the download is complete.
4. Ensure you do not go offline or reboot your computer during installation.
5. Click Finish once the installation completes.

Final Solution: Reset Windows Operating System

If the issue persists, resetting your Windows 10/11 operating system may resolve the problem.

1. Back up all personal data to avoid losing files during the reset process.
2. To reset Windows 10:
   • Select Start > Settings > System > Recovery.
   • Next to Reset this PC, select Reset PC and choose the desired options.
3. To reset Windows 11:
   • Select Start > Settings > System > Recovery.
   • Next to Reset this PC, select Reset PC and choose the desired options.

Disclaimer: Resetting your system will remove all files and settings. Ensure you back up important data before proceeding.

In Conclusion

If you are still unable to resolve Error Installing Microsoft Office 2021/2019/365, we recommend chatting with our assured experts for the best solutions. We guarantee quality service and value for your money.

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