You must have MySQL PHP module installed

Problem when installning G2, MySQL PHP module!

I have searched the site if someone else have had the same problem, and I found one post, but it didn't help me, therefor I'm sending it again!

My G2 installation halts at step 5, the Database setup.

I have MySQL och PHP5 installed on my Win XP box. It works great!
I have created several pages (.PHP) that uses connection to my MySQL
databases and all the different tables in it.

The problem now is, that I get a message that follows:
"You must have MySQL PHP module installed"

What do I need to do to fix this?

Best regards,
Andreas

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Gallery URL (optional): n/a
Gallery version: G2
Webserver (with version): IIS 5.1
PHP version (eg 4.2.1): PHP 5.0
phpinfo URL (optional):
Graphics Toolkit(s):
Operating system: Windows XP
Web browser/version: IE 6.x