Problem: After a fresh install of SQL Server 2008 R2 on a Windows 7 computer, where Windows user group BUILTIN\Administrators were given administrative rights, I was not able to log on to the database from Microsoft SQL Server Management Studio while logged on to Windows as a user who was a member of the Administrators group and thus should have been granted access. The error received was: Login failed for user 'COMPUTERNAME\user'. (Microsoft SQL Server, Error: 18456).
Solution: Turn off User Account Control, or if you prefer to leave it on, make sure you start SQL Server Management Studio as an administrator (right-click the icon and select Run as administrator).
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