A vulnerabilty scanner reported ; Attackers could potentially gain arbitrary access to the file or registry system on the SQL Server host. This vulnerability could possibly lead to further compromise of the SQL Server's integity.
One of the the sugesstion was to usw SQL Server Management Studio Express remove the BUILTIN\Administrator for the SQL 2005 Database login while keeping the SA account. After I deleted the BUILTIN\Administrator group access. My SA account login will login before but now I get an error " Login failed for user 'sa' The user is not associated with a trusted SQL server connection Error 18452.
When I tried to change the SQL server properties for security from just Windows Authenication to SQL and Windows Authenication I get an error; The Execute permissions is denied for object 'xp_instance_regwrite' database mssqlsystemresource, schema 'sys' Microsoft Error :229
Can someone help me switch modes to gain SA access ?