All Windows 2008 product keys require activation.
There's nothing wrong with the license key.
You can see license status and partial product key from the command prompt:
"DD" <DD@newsgroup> wrote in message
> recently we installed windows 2008 std by using the ms select license key,
> after 2 weeks , system prompt to activate the license key.
> is it something wrong with the license key or we need to activate the key
> first time installed windows 2008.