Fixing Error 0x800706ba: RPC Server Unavailable During Office 2021 Setup

Follow these practical steps to address the error code 0x800706ba when setting up Office 2021:

1. Reboot your PC: Often, simply restarting your computer resolves this problem. Reboot and attempt the Office 2021 setup once more.
2. Ensure the RPC service is active: Hit the Windows key + R to bring up the Run dialog. Type 'services.msc' and hit Enter. Verify that the 'Remote Procedure Call (RPC)' service is active; if not, right-click it and choose 'Start'.
3. Set RPC service to automatic: In the Services window, right-click the 'Remote Procedure Call (RPC)' service, select 'Properties', and under the 'General' tab, set the 'Startup type' to 'Automatic'.
4. Verify Windows Firewall settings: Press the Windows key + R, type 'firewall.cpl' into the Run dialog, and press Enter. Navigate to 'Allow an app or feature through Windows Firewall' and check that 'Remote Assistance' and 'Remote Desktop' are permitted.
5. Turn off any third-party antivirus: At times, third-party antivirus programs may block the installation. Temporarily disable your antivirus and try installing Office 2021 again.
6. Use Microsoft’s Office installation troubleshooter: Access the troubleshooter tool provided by Microsoft to automatically resolve common setup issues. Download and run it from the Microsoft website.