to deactivate old photoshop cs3 serial code's

Dear Sir/Madam,

I recently stumbled upon 2 older photoshop CS3 boxes at our office.

when i tried to install one of these and activate use one of the two serial codes i got the error message saying the codes need to be deactivated first.

As far as i know it the codes are currently not in use by anyone in the office, al employees that use photoshop were upgraded to CS5 last year (wich we have 5 pcs.)

I have the following problems with the licences.

both of the photoshop CS3 serials are:

* not registrated to any of our employees

* not registrated to any of our pc / laptops

Now i am wondering how i can deactivate these two codes.

And truly hop u can help me figuring this one out.

Yours Truly,

Tribal-IM