After the installation of the reporting services, I tried reapplied SQL 2005 SP2, but failed with an authentication error.
I'll be glad to provide any information on this.
Below is an extract of my HotFix.log:
03/27/2009 16:09:17.076 Registry: Opened registry key "System\CurrentControlSet\Control\Session Manager"
03/27/2009 16:09:17.092 Registry: Cannot read registry key value "PendingFileRenameOperations"
03/27/2009 16:09:25.045 Error, cannot determine sysadmin status for instance: MSSQLSERVER
03/27/2009 16:10:00.951 Error, cannot determine sysadmin status for instance: MSSQLSERVER
03/27/2009 16:13:23.029 Error, cannot determine sysadmin status for instance: MSSQLSERVER
03/27/2009 16:19:22.717 Error, cannot determine sysadmin status for instance: MSSQLSERVER
03/27/2009 16:31:09.670 Hotfix package closed
Thanks so much