[Help] Connect Web to MSSQL 2008 R2

[MuHyC]

Warning: mssql_connect() [function.mssql-connect]: Unable to connect to server: 127.0.0.1 in D:\xampp\htdocs\Includes\SQL.php on line 18
Can't Connect To MSSQL Server!


have can i fix this?
sorry for bad eng