Hi,

Whenever a system in renamed at the o/s it has to be renamed at the sql server level also. Try following steps. Login into the sql server system and try this.

If it is a default instance

sp_dropserver

GO

sp_addserver , local

GO

If it is a named instance

sp_dropserver

GO

sp_addserver , local

GO

and restart the sql server services and check out

SELECT @@SERVERNAME AS 'Server Name'