I would run Microsoft Office Diagnostics before the repair. You can access MS Office Diagnostics through Word - and Word Options and Resources but it is probably quicker to go to All Programs - Microsoft Office - Microsoft Tools and click on Microsoft Office Diagnostics.
Did you uninstall before installing? If effectively you upgraded then you may have installed on a corrupt installation. You may have to totally uninstall and reinstall. Have you done any virus/malware checks?
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