A family of Microsoft word processing software products for creating web, email, and print documents.
Try repairing the Office installation as detailed in the Knowledge Base article at:
If that does not help, then you might remove all traces of the Office installation by downloading the fixit from the following article:
http://support.microsoft.com/kb/2739501
saving it to your computer and then running it.
Then reinstall Office by logging into www.office.com/myaccount with your registered email address and click Install Office.
BEFORE REMOVING THE OFFICE INSTALLATION, MAKE SURE THAT YOU ARE ABLE TO LOG INTO YOUR ACCOUNT AND THAT OFFICE IS ASSOCIATED WITH IT!
If you actually have Office 2013 (locally installed) rather than the subscription version provided through Office 365, then you can't get Office through your Microsoft Account. Instead, see https://products.office.com/en-us/download-back-up-restore-microsoft-office-products