Thank you very mutch for reply.

What i really want is that NO windows account (domain admins or domain users) can access the SQL Server 2005.

CAn they have access to the OS (w2k3) where the SQL Server 2005 is installed but not have acccess to SQL Server?

1) If i delete the builtin\administrators and all windows accounts from the security account will i achieve what i want?

2) What about the SQL Server service and the SQL Server Agent service, this two services i want they they still run under a domain account. Does this account need to have previleges inside the SQL Server?

Thank you