install error for vbulletin
 

PLEASE HELP! I am VERY new to this and so far managed to get to the point in the tutorial that stated to type in the address of your site as follows:

http://yousite.com/install/install.php.

This is for my vbulletin forum but the page does not come up with the window asking for my customer number, it just comes up as, this page cannot be found.

I'm assuming that yes, something was not put into the config.php correctly. But it is in public_html folder and I did what the tutorial said, including database name, username and password.

What else could there be to fix? THANK YOU for any help, I am at such a loss.