I have just had the worst crash, where the system HD was deleted. I do have a backup, but before upgrading to Acrobat X Pro. My question is, since I cannot deactivate before reinstalling, how is this going to affect me once I try to activate?
If you need to reset your activations you can contact Adobe and explain. There should be a telephone number on the activation screen and there are links on the Adobe support site so that you can do this through a web chat.