I am running MS SQL Server 2000 on Windows XP machine. Currently Authentication mode is set to "Windows only". I use Enterprise Manager, go to Properties for SQL Server engine, then to Security tab. I have no problems clicking on "SQL Server and Windows" radio button there. Then I click the "OK" button. When I reopen the Properties window, security mode is still set to "Windows only". Restarting SQL Server doesn't make any difference. I hope there is some simple explanation to this stupid problem. Will appreciate any suggestions.