My roommate connected his Macbook to my Xbox 360 through some third-party app but he's no longer my roommate and his computer still shows up on all the Video Library/Music Library/Picture Library sections as an option.
 
How can I delete it? I tried clearing the cache on my Xbox but that didn't work. What else could it be? It's annoying that it still shows up on there.

My roommate connected his Macbook to my Xbox 360 through some third-party app but he's no longer my roommate and his computer still shows up on all the Video Library/Music Library/Picture Library sections as an option.
 
How can I delete it? I tried clearing the cache on my Xbox but that didn't work. What else could it be? It's annoying that it still shows up on there.