If you have decided to upgrade your existing Windows XP to Vista, your existing XP key will be invalidated, preventing activation. This move is to prevent users from dual booting or using the XP key on another computer. This is reasonable, as you are upgrading, removing the need for the older key.

But here comes the question. What it you decided to downgrade back to Windows XP? Having activated the Vista Upgrade, the old Windows XP key would be rendered useless already… *shrugs

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