I've been going NUTS with this 10.1 agent.
I have a batch of machines that were previously imaged with a 'wrong' install of the 10.1 ZAA. Now, when they are re-imaged with a 'fixed' image (I install the ZAA from scratch during setup after sysprep mini-setup runs), they all still pull the same GUID and the 'last one wins' and only it shows up in the zone/realm.

How do I gut the machines of their 'old' identity. ??

I've tried using ZISWIN to clear the old data, disabling the service on the way. then unr, then cc, then reg. Only the last one shows up.