If that old hard drive has Windows XP on it your problem will be because Windows XP does not allow you to 'move' a working installation from one system to another in this way. There is no 'official' procedure by which you can successfully migrate a working XP installation from one machine to another, and the various 'unofficial' guides to doing the job are only sometimes successful.
The correct procedures when changing to a new system (an upgrade of the motherboard is the same thing as a new system) is to format the hard drive and install Windows XP fresh and clean again.
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Grandad
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since Mar 2004