Unlike Adobe, which has an online mechanism for removing the license from a
copy of Acrobat (for example) so it can be licensed on a different computer,
Microsoft has no such mechanism. Removing Office 2007 from a computer and installing it to another computer. If you cannot proceed with activation, follow
the instructions for telephone activation, and explain the circumstances.
They will provide you with the needed activation information.
This are the links about Office Activation:http://support.microsoft.com/kb/293151
And Microsoft Product Activationhttp://www.microsoft.com/piracy/mpa.aspx