Index Name Last Modified -rapidshare Pavideo Google Search Comes Up "index Of /"?

Google search comes up "index of /"? - index name last modified -rapidshare pavideo

When I recently checked the Google website as an "index of /" are listed instead of the normal title and description. The description "Index of /. Last modified Size Description. [DIR] Parent Directory 05-Jan-2009 14:02 - [DIR] os_commres / 29-Aug-2008 19:06 - [DIR]

What would be the cause? And how can I add the title and description correct?

Thank you.