Hi.
I have some OEM Vista Business DVDs which I haven't used at all, only the seal opened so that the product key is visible.
The thing is, when I'm about to sell these, noone would believe if the DVDs & Product keys are still unused, just because the seal has been removed from the boxes and the keys are visible.

I couldn't think of any way to prove that they keys are still new and unused.. Is there any way, instead of installing it of course..?

You may be telling the truth, but people will think it is pirated. Only way I know is to install.

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Celestra