Relative Path - problem with configuring WPG2

I'm a newbie to php, to Gallery (1 or 2!) and all that goes with it. Please speak slowly if you'#re able to help...!

I managed to get G2 working well, and seem to have installed WPG2 fine, but am having some big trouble with the relative paths validation for the plugin (on the /wp-admin/options-general.php page).

I installed my WPG2 to a new folder on my server called "NWCCA_Gallery2" - so it's relative path from the root is NWCCA_Gallery2/gallery2/

I've put a copy of the embed page in the root folder (the main bit which contains my Wordpress and wp-admin folders, etc)

So... for "Embed Gallery2 Page Name", I've put "wp-gallery2.php"

... and for "Path from web document root" I've just entered "/"

When I try to validate the settings, I get
Gallery2 in G2 Path Failed
Embedded Page Found? Skipped Due to Previous Error
Gallery2 init::? Skipped Due to Previous Error
Gallery2 Module: ImageBlock Active? Skipped Due to Previous Error
Gallery2 Module: ImageFrame Active? Skipped Due to Previous Error

Pleeeeeeaaaase help me here. Does G2 need to be installed in a certain folder (I could always delete it and reinstall if it did).

THANKS

Dave

WP 1.5.2
WPg2 1.0
Gallery version 2.0.2:
PHP version Don't know how to find this out:
Webserver Apache
Database MySQL 4.0.18