Vista - Windows Media Library on Network

Hi there, i just got a new PC with Windows Vista installed on it. My problem
might not be just with Vista but i figured i had to start somewhere. I have
a Shared Music/Video library on my LAN so that i dont have to work about
transfering music from computer to computer. now the problem is that when i
try to add the music into he Windows Media Player Library it works just find
its that about every 10-15 minutes it asks for a password. the odd part about
it is that i dont have the shared directory passworded. Also if i just hit
cancel on the login in box the music still continues to play, its just
annoying to have the box come up @ real inoportune times while playing a game
or watching a movie. Thanks for the help in advance.