I got a good student deal to buy Windows 7 and I chose to receive it as a download instead of having them ship a CD to me. They will send me an activation key in an email which I will obviously save, but since I will not have a physical CD, how would I go about reinstalling in case I ever had to in the future? Would burning the Windows 7 installation file to a disc work? That way I could save it for the future if I ever need it and then just re-enter the activation key. Thanks.