Build 1200/900 will not work when you have ArcMAP 9.3 installed. Installing 1200 caused 9.3 to not startup, and fixing 9.3 caused build 1200 not to work. I have reinstalled build 900 and it crashes 9.3 too. What gives, can't you have both on the same machine!!!!!! Someone thorw me a bone here. Did not have the image server, or other files running that is said needed to be disabled.