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I have 2 computers which I installed the same license key too. I have multiple licenses, so I wish to fix this situation. I am getting those warnings on both my computers.

How can I fix this?

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You can't remove the message. You can only install ONE key on ONE machine at ONE time. – Hello71 Jul 11 '10 at 21:22

You should really contact Microsoft about this. However there are some workaround methods available (I've never tried them but they may work. Or not.):

There is a change product key if you bring up Properties.

enter image description here

Not sure if its still available for you.

Or try these:!
(Well leave the loader/illegal stuff out, just use the steps to get back to the original state.)

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