I am desparate already. I tried 2 times the same installation guide walkthrough and I receive the same error. I am trying to install Unity 4.2(1). Everything works fine until I arrive at the schema update step. I run the Schema Update from the CD (so that isn't a problem) but it keeps telling me the same error. Setup failed to initialize active directory and gives me 5 "tips" to check if everything is ok (it's the same error as someone else described here, but for him the solution was to run it from a cd not from the hard-but I AM running it from the cd). I also set the schema update allowed key to 1. Could you please help ?