Hi Deirdre,
Let us try the following steps and check if it helps to resolve the issue.
Step 1:
Repair the Office 365 installation using the Online Repair feature and check if it helps.
http://office.microsoft.com/en-in/project-help/repair-or-remove-office-HA010357402.aspx
Step 2:
Run the Fix it from the following article to remove all traces of Office on the system.
http://support.microsoft.com/kb/2739501
Once the Fix it completes removing all traces of Office, then you may re-install Office 365 and verify the results.
To download and install Office 365, you may login to the My Account page on Office.com with the Microsoft account you used to register or purchase.
http://office.microsoft.com/myaccount
Follow the steps and let us know if that helps. If the issue persists, reply and we will be happy to help you.
Thank you