Hi all,
I've found that the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\100\Machines ---> OriginalMachineName
has an incorrect value. It has the value corresponding to my old server name, I've renamed it and followed the procedure of sp_dropserver 'oldname' sp_addserver 'newname','local'
Have I to correct the key's value?