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Webstore, Invalid Key error when installing Office on personal computer
Generally, this means that another similar Microsoft product is already installed on your computer. Make sure that any trial versions of Microsoft Office, any other version of Microsoft Office or Microsoft Works are uninstalled from your computer. Reboot your computer and try your Office installation again. This error is not common when installing Office 365 versions of Office since it does not use a product key. If you continue to have issues please email firstname.lastname@example.org.
I'm installing a Microsoft Office on my personal computer and I am getting an error message that my key is invalid. What do I do?