phpBB : Critical Error

Could not connect to the database PHP Warning: odbc_connect() [function.odbc-connect]: SQL error: [Microsoft][ODBC SQL Server Driver][SQL Server]Login failed for user 'sa'., SQL state 28000 in SQLConnect in C:\WebApplications\ForumAmazon\phpBB2\db\mssql-odbc.php on line 54 PHP Warning: odbc_error(): supplied argument is not a valid ODBC-Link resource in C:\WebApplications\ForumAmazon\phpBB2\db\mssql-odbc.php on line 379 PHP Warning: odbc_errormsg(): supplied argument is not a valid ODBC-Link resource in C:\WebApplications\ForumAmazon\phpBB2\db\mssql-odbc.php on line 380