Windows Media Player 10 Problem

when ill be playing a movie half way and time during the movie it will stop, and i will get this message

Windows Media Player does not detect storage media in the selected device. Insert storage media into the device, and then try again.

i don’t know what’s its talking about, all my movies are on a external hard drive but that has about 5 gigs free memory???

are your movies image files? most movies are dual layers and require dl media to burn… u can shrink with dvd shrink but that really compresses it. have you also try updating your video card drivers and checking microsoft web site for a patch?..tell me what your systme is composed of…i may be able to help