Navigation Issues For Sub Pages

Hi

I have set up a site using Site Assist Pro with the pages being .php pages.

I ahve set the site up on my local machine in C://Wamp/www/GuitarPlayerResources/

When I F12 the index page, the index page opens and the address in the URL is index.php

However, when I try to either go to my first menu link which is Guitar or one of the menus within the guitar menu I get Page Not Found pages and the URL's are similar to those below.

acousticguitars.php

guitars.php

Notice how GuitarPlayerResources is not in the URL

I am sure I have to change something in Menu.php to reflect the correct path but do I have to do this in bothe the content and the home Menu.php files and what do I ahve to change?

Could you be quite specific with the answer as I am not an expert and what may seem obvious to some will probably be a daunting task to me.

Thanks in advance

Oh, I have checked the forums already for this but have not managed to understand the answers I have seen up to now.

Regards