How to connect to sql server database

[eluser]Mohammed Zayan[/eluser]
Hi there,
My PHP version is 5.4.7 and I have sql server 2005 installed in the computer.
I want to connect to sql server database.
I edit config\database.php

Code:

$db['default']['dbdriver'] = 'sqlsrv';

I download SQLSRV30.EXE from this link and setup it. It gives me some dll libraries

I take these dll and put it in

Code:

D:\xampp\php\ext

and I edit php.ini file and add

Code:

extension=php_sqlsrv_54_nts.dll

and restart xampp by stop it and start again.

I have this error
Fatal error: Call to undefined function sqlsrv_connect() in D:\xampp\htdocs\test\system\database\drivers\sqlsrv\sqlsrv_driver.php on line 76
How can I fix it??