GeorgeM wrote:
I bet the key had already been activated. In which case you will have to call Microsoft to get them to sort it out. Unless it's a VLK then it should have unlimited activations.
EDIT: You should be able to install Windows without a product key, or is it only Vista that gives you the 30 day grace period?
XP lets you install with a bad key, but most versions of the disk ask for the key during the install. You have to feed it something it likes.
OP, you could always rescind the EBay sale. Return the product, contact paypal... it's a pain. But, the package may have been opened previously.
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