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My name is David.
The quickest way to resolve the issue, if you have a copy of your Microsoft Office installation files and license key, is to uninstall Office, then restart the computer, then reinstall Office.
If you have Office 2011, click the link below to download and run the Office removal tool first:
Once the removal is completed, restart the computer then proceed with a standard installation and that should fix the problem.
Please let me know the result and if you need assistance with any of the steps.
Do you still need assistance?