So if I burn an ISO to a flash drive and have several keys for Win7, will I be activating the same copy of 7 or would they all act like separate CD's would? I have 3 servers that I don't have an optical to and the USB Flash is the best idea for this. I did this with Vista and think I deactivated the first install with a second install and separate key for the second machine. The first machine immediately told me I had to re-register it. Does the installation ID bounce?