You should have uninstalled the trial, then rebooted, before installing from your CD, you'll now have to use this http://support.microsoft.com/kb/928218/en-us
"Kimberley" <Kimberley[ at ]discussions.microsoft.com> wrote in message news:DBC6FB48-F3FD-41E9-93D6-2A3BACE4A50D[ at ]microsoft.com...
[Quoted Text] >I downloaded a trial version of Microsoft Office Home and Student 2007. I > bought the disk and tried to use that product key to convert the trial, > the > product key was accepted but then I received an error message that the > installation would not complete. I receive a similar message if I try to > uninstall the trial (uninstall would not complete). So I cannot convert > my > trial, nor uninstall it and am at a loss of what to do next.
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