Kim, just to clear things up, I actually referred Greg (red1776) to this excellent sticky at the HardForum. Some users there have reported that they have had success using a single sysprep image with multiple configurations. Greg linked you to MS's page on the program, which also has the relevant info you need. Of course, that page is intended for users with fairly advanced knowledge, which must be obvious from the terms used. So if the OP did not understand anything, they can go with one of the usual methods to prepare your system for when you upgrade your motherboard. The usual process is to backup/format/install/restore, as stated by the creator of the sticky in the last post of the aforementioned thread, and sysprep is just an alternative to this long process. And it is perfectly legal AFAIK, since it requires an activation from MS before you can start using the OS. So even if it is an OEM installation, you can swap over the system HDD from one computer to the other, (provided it is not an HP or Dell PC with an OS pre-installed) and still require activation before using the OS, effectively still being within the boundaries of the EULA AFAICT. If this is not the way the EULA defines it, I'd be happy to know the actual terms.