I suspect that you will need to uninstall the trial version of office before
you will be able to install the office home&student. (won't lose any of your
documents with the uninstall).

Michael
Vista home premium

"liz" <liz@discussions.microsoft.com> wrote in message
news:C35EF458-941E-4ECA-A209-B7546FFFC03E@microsoft.com...
> Hi I bought a new Fujitsu siemens (windows vista) laptop to do my college
> work on. It came with a trial version of office on it which I activated.
> I
> then bought a copy of office home and student and tried to enter the
> product
> key to update to the full version but it keeps saying it is incorrect???.
> This is the second copy I have bought now!!!
>
> Please someone help!
>
> Thanks
> Liz