+4  A: 

Check out phpinfo to see if the mysql functions are compiled with your PHP

<?php
    phpinfo();
?>

Since in some versions of php, its not default with the install.

Edit for the Update:

You should have a full MySQL category in your phpinfo();

See this for example: https://secure18.easycgi.com/phpinfo.php (googled example)

Ólafur Waage
+1  A: 

It sounds like the version of PHP you are using has not been compiled with MySQL support, or has not been enabled in the php.ini.

Geoff
+1  A: 

Looks like you haven't got the MySQL PHP extensions installed! You shouldn't have to do any configuration other than installing the correct modules (and shouldn't be doing anything with ADODB).

PHP comes in 2 versions as well - a CGI version and an ISAPI module. You're best using the ISAPI version with ISS and adding all the trimmings...

James Marshall
+1  A: 

I found the solution: How do I install MySQL modules within PHP?

Zack Peterson