I got this commonly seen version error when I tried to upgrade my RC version of Office 2010 to RTM
Setup is unable to proceed due to the following error(s):
Microsoft Office 2010 does not support upgrading from a prerelease version of Microsoft Office 2010. You must first install any prerelease versions of Microsoft Office 2010 products and associated technologies. Correct the issue(s) listed above and re-run setup.
I had already removed by RC Office and Visio. Turns out the problem was I had the Outlook Hotmail Connector (Beta) installed too. Once this was removed the install worked fine.