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Error Code 30170-4 of Microsoft Office commonly occurs because of an existing installation of MS Office pack in your computer system. Please note that this error is relevant to all the editions of Microsoft Office 2013, office 2016 and Microsoft Office 365.<br><br>
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Fix: Microsoft Office Error Code 30170-4 Common Causes 1. Firewall or antivirus interference Security software is blocking the install. 2. Corrupt temporary or Office files leftover from a previous installation. 3. Missing system or Office updates pending patches may interrupt the install. Step-by-Step Fix 1. Temporarily disable firewall & antivirus - Turn off Windows Defender or any third-party AV/firewall completely before installing. 2. Delete temp files - Open C:\Windows\Temp and delete contents. - Then run %temp% in the Start menu and clear those files (skip any in-use). 3. Run System File Checker (SFC) - Open Command Prompt as Administrator. - Execute: sfc /scannow - Fix any issues it reports. 4. Repair or fully uninstall existing Office - Go to Control Panel Programs and Features, select Office, then click Change Repair (or Online Repair on Win 8/10/11). - If repair fails, uninstall completely, reboot, then reinstall Office.
5. Install Windows updates - Run Windows Update, download and apply all pending updates, then reboot. 6. Re-attempt Office installation - After rebooting post-updates, reinstall Office from your account or installation media. Additional Tips - Use a wired connection if your WiFi is unstable. - Try the Office offline installer if network issues persist. - For corporate or restricted networks, switch to a home network or disable proxy settings temporarily. Recap Checklist - Disable firewall & antivirus - Clean temp folders - Run sfc /scannow - Repair/uninstall and reinstall Office - Apply Windows updates - Use wired/offline install