Hi, and thank you for asking your question.
If you have the product key for Office 2010, you can download and reinstall it yourself using the following link:
Fill out the required info on the page (including the product key) and click Submit.
Once submitted, you will be able to download the Office setup file - done that, open/run the downloaded file to install Office 2010 accordingly. This should do it.
If you need any further assistance with this issue, please be sure to reply back using the box below.
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