Customer is looking to move from ZDM 7 to ZCM 10.1.1

I have setup a POC for a customer and took 5 of their existing WinXP (which had the ZEN 7 Agent) wks and 1 Vista wks, deployed the ZCM Adaptive Agent, all worked as designed, then I went to check the ZCC and I did not have all my devices in ZCC. I started looking at things and noticed that 3 out of 5 wks had the same GUID assigned. I went and ran ZISWIN, cleared everything, powered off all pc's and treid to bring them online 1 by 1 and registereging them manually. Same problem, they get the same GUID and continue to knock one another off.

Any help would be much appreciated, I also have an SR open on this issue.