Not sure,

At this point in time, I'm starting to think it may be related to the Microsoft SP3 update I've recently installed. Starting to see similar install issues for other applications. We've had problems where the Compaq Agents would not install on a Server with SP3 and the Exchange Admin Tools would not install on a Windows 2000 Workstation with SP3 but would on one similar with only SP2... Not fully pointing the finger at SP3 yet but seems very coincidental.