I have an installation of win7 Ultimate x64 that is going wobbly. So I want to run repair on it. But I can't find the original disks. found the microsoft site where I can download a win7 ISO if I give them the key from that machine. That's fine. And I'll do it. But just wonder - that will be my validated key they're asking for so does that mean that the ISO I download will be good only for that machine? If I want to cover my other machines I need a downloaded ISO for each different machine ? Or the one ISO will serve as repair disk, recover, reinstall, whatever, for any matching (7 Ult, x64) install? Oh, yes, I've got another one, too: what about if the machine dies before I can rescue it? With a crashed motherboard? How can I do a reinstall on another board - these validations tie the software to the hardware, don't they?