Replacement hard drive

I have 3 PCs. One failed and I have fitted a new hard drive. It seems to work OK. All three were protected by Bitdefender but the one on which I have fitted the new hard drive is not seen. How can I remove Bitdefender from the old machine? Note I cannot do it from the the old machine because the old machine does not see it. I will then put Bitdefender on to the machine which has the new hard drive.

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