Problem with install AOS server: Object reference not set to an instance of an object

Hello, people!

I install ax 2009 on local comp.

First i change active computer name in registry editor.

Second i install ax 2009 and generates an error:

: System.NullReferenceException

Massage: Object reference not set to an instance of an object.

 Full text: System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.Dynamics.Setup.Misc.GetMachineDomain()
   at Microsoft.Dynamics.Setup.Misc.GetMachineAccountName()
   at Microsoft.Dynamics.Setup.InstallSqlServer.GrantAosAccessToRemoteSqlServer()
   at Microsoft.Dynamics.Setup.InstallSqlServer.GrantAosAccess()
   at Microsoft.Dynamics.Setup.MainForm.AosDbAccess()
   at Microsoft.Dynamics.Setup.MainForm.s250Timer_Tick()

I think its problem with install aos server. How solve this problem? 

P.S. Sorry for my bad english