Microsoft Office error code 30034‑4 typically appears when installation fails due to missing or corrupted setup files, internet connection problems, or permission issues. To resolve it, first ensure a stable internet connection and try downloading the Office installer again to eliminate corrupted files. Next, run the installer as administrator to grant full permissions. If the error persists, temporarily disable any antivirus or firewall software that might be blocking the installation. Running the System File Checker by executing
sfc /scannow in an elevated Command Prompt can help repair any damaged Windows files interfering with the setup. As a final step, uninstall Office completely—using Microsoft’s Support and Recovery Assistant if needed—then reinstall with a fresh download. For a full step-by-step troubleshooting guide, check out this detailed article.