I have Windows Vista that I bought and have a key for, and is already activated. I would like to keep a copy ready on a second hard drive (not a second machine) in case something goes wrong with it, which it has before, so I can just swap them. Often, I do not have internet access. Is there a file that stores the activation that I can copy or replace on the second drive so that I do not have to activate it on the 2nd install? Thanks.