Often, restarting your computer will fix most problems and errors. However, if this does not work, you can try repairing your software if you're using a Windows computer.
1. Begin by typing Control Panel in the search box in the lower left corner of your computer, next to the Start button. Go to Programs and Features.
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2. Scroll down the list of programs to Microsoft Office Professional - the instructions are the same no matter what version of Office you have.
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3. Click once on Office to highlight it - once it is selected, you'll see that you have a set of buttons at the top of the list. Click on Change. It looks a little different in Office 2016 and in Office 2019.
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4. In Office 2016, you'll see a screen that says setup is preparing the necessary files.
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5. On your next screen, click Repair and then Continue. Office will be a repair of your installation. This can take between 15-45 minutes and you'll need to close all of your Office products while it runs.
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In Office 2019, you'll see a slightly different screen, but you can first try the quick repair to see if that resolves your issue. If it doesn't try the online repair.
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Note: This will repair the entire Office suite even if it's just one application you want to repair such as Word or Excel.