My issue is that the computer won't even pwer on. It's an Xp machine, so I'm probably going to replace it soom. I have a laptop with Vista, another with Win7, a tablet with WIn8, and a small laptop running 10.
When I tried to install Office on another machine, I got an error message.
It said I couldn't authorize because I've used all my authorizations.


So I need to know if I can de-authorize my old machine.
Just having the discs apparently doesn't mean squat.

You can't 'de-authorize' an Office installation. What the message means is that your copy of Office has already been installed on as many PCs as the licence allows. In that case, if you want to transfer the licence to a new PC, you will need to use telephone activation, rather than relying on on-line activation.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]