Register Page - FATAL ERROR

im can see this :
Fatal error: Call to undefined function mssql_connect() in C:\xampp\htdocs\register\index.php on line 25


how to fix it ? :(

config the conf.php ur sql user and pw
and ur md5 key ... maybe works

Fatal error: Call to undefined function mssql_connect()

Notice: Undefined index: do in C:\wamp\www\index.php on line 30

Undefined index: step in C:\xampp\htdocs\register.php on line 92

Undefined variable: _SEVER in C:\xampp\htdocs\register.php on line 94

what that?

Download these drivers
[Only registered and activated users can see links. Click Here To Register...]
extract them in C:\Xampp\php\ext\
Don't forget to enable mssql in php.ini