AD browser in setup.asp was showing only a small part od the entire structure.
I change the settings and run the "iis apppoll\hap" as a domain admin
Application Pool Identities : Configuring Security : Installing and Configuring IIS 7 : The Official Microsoft IIS Site
now the AD browser works and I can see the entire structure.
Acording to you, could I run "iis apppoll\hap" with a less privililedged account?