[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified

[eluser]Unknown[/eluser]
I solve this problem myself.

If I change 'hostname' from:

Code:

$db['sqlserver']['hostname'] = 'Driver={SQL Server Native Client 10.0};Server=192.168.10.160;Database=<DB>;MultipleActiveResultSets=true;';

to

Code:

$db['sqlserver']['hostname'] = 'Driver={SQL Server};Server=192.168.10.160;Database=<DB>;MultipleActiveResultSets=true;';

It works again.

Very weird. For reference to those who are struggling in this problem.