Cannot add new folders

Hi guys,

I just reinstalled XP 2005 on my PC. I have been downloading the updates etc
as normal and have everything up to date.

I ran media centre and went through the set up procedure and finished it all
but forgot to select a folder i keep some video files in. When i try to add
the files/folder (green button, highlight my videos, click more info button)
the option to add/remove isn't there!

any ideas how i can fix this?

many thanks