Uninstalling/Reinstalling onto different machines.

[Ygorl]

The key lives in a little file in your dominions3 directory. It is called "key". This doesn't matter, though; there is no concept of freeing the key (the key is checked against a known list of compromised keys, and is checked against everyone else's key in a multiplayer game when you play multiplayer). Install from your CD onto your new computer, and you will be fine.