ok I've changed and gets ;

Fatal error: getphpbbTab::require_once() [function.require]: Failed opening required '/forum/extension.inc' (include_path='.;C:\php5\pear') in C:\%path%\phpbbconnector.php on line 124

it says "include_path='.;C:\php5\pear'"... php5 path is wrong

Does your server have a $_SERVER variable?

www.foreverayna.com/info.php
no
what can i do ?

Since your forum is based inside your Joomla site... take these 2 files in the ZIP... remove the abspath_ prefix and overwrite the files on your server... this should base it on Joomla's root versus the DOCUMENT_ROOT

thanx geeffland. I'm trying and will report the result

Now it works
all the things were about "$_SERVER" variable ?
thanx for your help geeffland...