Managing NT 4 with IT Assistant

I've recently begun testing ITA 6.5 with Server Agents 4.41.  On the windows 2000 boxes, the install is very straight forward and the system discovers them fine (CMI, SNMP).  I've tried to configure the same on an NT 4 System but the system is discovered (DMI) but is unclassified. I've installed the WBEM software before the agent and am dumbfounded.  What am I missing?   

Should this work as on the W2K servers?

Thanks in advance....