If I upgrade my Windows XP computer to Vista, does that mean I can upgrade my Windows Me machine to XP, using the upgrade CD I used before -- or would I be breaching the conditions of my "single user" agreement? Dougie Firth
PC manufacturers generally license Windows at the lowest price, where each copy is specifically tied to a single PC. Microsoft now makes this absolutely clear in the EULA, or End-User Licensing Agreement. I believe that re-using the XP upgrade CD would violate that agreement.
Also, the Vista upgrade has to be done from a validated copy of XP, and I'd expect Microsoft to invalidate your XP key when it validates the Vista key. Even if it didn't, every XP key is associated with a hash number calculated from the PC hardware (motherboard, processor, etc) that it is used on. Your Me system's hardware would produce a completely different hash value. Of course, you could still try it.
