raised exception class TDBXError with message 'DBX Error: Driver could not be properly initialized. Client library may be missing, not installed properly, of the wrong version, or the driver may be missing from the system path.'.
http://docwiki.embarcadero.com/RADStudio/XE7/en/DbExpress_Database_Specific_Information
Install the SQL Server Native Client for Windows
2008
http://msdn.microsoft.com/en-us/sqlserver/ff658533.aspx
2014
http://msdn.microsoft.com/en-us/library/ms131321.aspx
SQL Server 2000：sqlsrv32.dll、Ntwdblib.DLL
SQL Server 2005：Sqlncli.dll
SQL Server 2008：Sqlncli10.dll
SQL Server 2008 R2：Sqlncli10.dll
SQL Server 2012：Sqlncli11.dll
http://jimshu.blog.51cto.com/3171847/1397348
sql2008在這里下載操作系統對的sqlncli.msi setup ok！！
http://www.microsoft.com/en-us/download/confirmation.aspx?id=27596
X86 Package (sqlncli.msi)
X64 Package (sqlncli.msi)
IA64 Package (sqlncli.msi)
安裝包給system32和SysWOW64路徑下 放2個文件sqlncli10.dll、sqlnclir10.rll
win7 64位os，刪除C:\Windows\SysWOW64\sqlncli10.dll文件，就連接失敗！把sqlncli10.dll放到應用服務器的exe目錄下也不行，說明是只能識別到SysWOW64目錄里。
2015-01-19 14:38:31 [FireDAC][Phys][ODBC]由於系統錯誤 126: 找不到指定的模塊。 (SQL Server Native Client 10.0, C:\windows\SysWOW64\sqlncli10.dll)，指定驅動程序無法加載。
如果沒有安裝包sqlncli.msi，從已安裝的機器上拷貝這2個文件，也是報錯
2015-01-19 14:55:49 SQL State: 08001, SQL Error Code: 0
A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow remote
connectios.For more information see SQL SERVER Books Online.
總結：只能安裝sqlncli.msi來解決
2015-01-19 14:55:49 SQL State: 08001, SQL Error Code: 0
A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow r