Vista Media Center library setup

Hello all,
i hope some one can help with this is there any way to remove a hard drive
from the media center library?

the prob i have is on one of the drives i have 2 folders 1 filled with files
which are NOT media files (althought the extentions would tell you otherwise)
and the other folder has media files, i told setup to include "J:\Movie
Clips\" but it tries to have "J:" & "J:\Movie Clips\" and as it tries to make
thumbnails it locksup and crashes.

any ideas?