• Navigate to C:\Program Files\Common Files\microsoft shared
  • If there is a folder called OFFICE15 or OfficeSoftwareProtectionPlatform delete that folder.
  • Navigate to C:\Program Files (x86)\Common Files\Microsoft Shared
  • Same as above, If there is a folder called OFFICE15 or OfficeSoftwareProtectionPlatform delete that folder.

Now, try reinstalling.