Need help with Ultimate SEO URL's

[lewisqic]

Hi all,

 

I just installed chemo's Ultimate SEO URL's on my website and i'm having some trouble. Everything on the admin side works fine, and i can also access my home page(index.php) just fine. But when i click on any category or product then it gives me a page that says "The requested URL /directory/index.php was not found on this server." The URL of the page displays "http://cylinderstoves.com/catalog/tents-c-22.html" I need help with how to fix this error so that i can access my pages without the 404 error. thanks.