My wife has a laptop running Vista. Its OS has become corrupted, and we'd like to wipe it and start over. Like, right now, since she has work to do for school. I bought a full copy of Windows 7: NIB, the DVD and password, at Best Buy. I have already installed it on my own laptop, a few months ago. Can I use this same disk to put Windows 7 on my wife's laptop? Can I buy another license somewhere, online? If I were to use the password that came in the box (the one I already used for myself), what would happen, e.g. would my own laptop somehow know and freeze itself, etc.?