Solving Error Code 0x80070003: Incorrect Source for Office 2021 Installation

To tackle the error code 0x80070003 during the installation of Office 2021, consider the following approaches:

1. Verify Internet Stability: Ensure your internet connection is reliable before attempting to download and reinstall Office 2021.
2. Temporarily Disable Antivirus: Antivirus programs can disrupt installation. Temporarily disable yours and attempt the installation again.
3. Browser Cache Clearance: Clear your browser’s cache to facilitate a fresh download and installation of Office 2021.
4. Install with Admin Rights: Right-click the Office 2021 installer and choose 'Run as administrator' to install with necessary privileges.
5. Utilise Microsoft’s Troubleshooter: Use Microsoft’s dedicated troubleshooting tool to diagnose and resolve installation issues.
6. Confirm System Compatibility: Ensure your system meets Office 2021’s requirements. Upgrade your system if it falls short.