Summary: 5 items. 0 succeeded, 1 failed. Elapsed time: 00:00:53 Organization PreparationFailed Error:The network path was not found. Warning:An unexpected error has occurred and a Watson dump is being generated: The network path was not found. Elapsed Time: 00:00:27 Copy Exchange FilesCancelled Hub Transport RoleCancelled Client Access RoleCancelled Mailbox RoleCancelled how can i solve this, I h've already registerd schema (regsvrschmmgmt.dll) but nothing works. this installation is for experimental basis for first organisation

I think you see service Remote Registry (status :Started) Run-->Services.msc-->Find service Remote Registry-->Start if it Stopped

Hello, why are you trying to install a beta version of Exchange 2007? Just download the SP3 installation file and install Exchange with this file. Greetings, Toni