how to fix my boxee tv problem

[machine1320]

hey guys and gals
i have a problem with getting boxee tv to work with ubuntu 8.1 64bit amd version. back before there was a way to make it work i tried to use boxee and somehow i set my update manager to look in the repository for the 64 bit amd version, well now i get this message

Failed to fetch http://apt.boxee.tv/dists/intrepid/m...64/Packages.gz 404 Not Found
Some index files failed to download, they have been ignored, or old ones used instead.

and i dont know how to remove it so i can download it form boxee. i installed the fix package but if i try to follow the directions on the boxee site i just get the above message..

im new to linux and love it im just not up on how to use it well yet

any help is greatly apprecieated
thanks

[waterhead]

You may need to change or remove a repository that it is using. From the main menu, open this program.

System-->Administration-->Software sources

Check the Third-party and Update tabs. Make sure that they are correct for the Boxee repository.