Quote by comp-elect: "You are attempting to install the Upgrade version of Microsoft Office 2007. When installing upgrades, you MUST have an earlier version of the program installed on your computer or at least the Key Code of an earlier version of the upgrade software. If you have an earlier version of Microsoft Office, look for the Key Code and use that to continue with the install. Microsoft products that qualify for upgrade to Office 2007: ?Microsoft? Works 6.0