"this modification is not allowed because selection is blocked"?

[Ann]

Pls help why does MS Word 2007 said this while I try the trial product?
(after the trial product key already entered in?"

 

[garfield-n-odie [MVP]]

You need to activate the trial software before you can use it. See
http://office.microsoft.com/en-us/help/HA012334341033.aspx and
http://us1.trymicrosoftoffice.com/faq.aspx for more information. If
your computer previously had an expired trial version of Office 2007,
then you cannot reinstall the trial software to extend the trial period.