If you failed to uninstall any trial version, then rebooted, prior to
installing your paid for version, that is the cause of your problem
Using ad/remove dialogue you need to uninstall all and any versions of
Office 2007 shown, together with any activation assistant, clear temp files,
then reboot, prior to installing your paid for version

"macnelbo" <macnelbo@discussions.microsoft.com> wrote in message
news:52212DD7-BBA2-4BBB-8C74-CEF90C6B5A23@microsoft.com...
>I bought the full version of MS Office Professional Plus 2007 in the middle
> of March 2009 and it was working fine for just over a month. Just
> yesterday
> I went to use Word and Excel and both are locked with the message - 'This
> modification is not allowed because the selection is locked'.
>
> I've gone through all the info I can find and everything is saying that my
> trial version will have run out. I have bought the full version so this
> not
> possible.
>
> What can I do to unlock all my office programs????
>
> Please help...
>
> --
> MacNelbo