Hey, the resealler should have the cd/dvd but it doesn't mean he have it, cause actually where i'm from, mostly of the time we go and buy a new laptop and it cames with Vista installed (for example) but no cd/dvd included... so u have to create it (burn it) using the information in the second partition...
Besides...
There are a few programs that allow you to recover your information after you re-install your OS or format ... the most important thing now is that he get access to it
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