Windows media player error when trying to reproduce all the music

[Crazyfaith]

So I'm getting this error whenever I try to open all my music

but if I try to open any playlist or song it works, I tried to find the solution but I coudn't find any, is there anything I can do?? I restart the pc several times but nothing happened

 

[Crazyfaith]

Ok here is the solution http://answers.microsoft.com/en-us/windows/forum/windows_7-pictures/songs-do-not-appear-in-the-windows-media-player/a6e80b2e-7367-4529-9dab-5a38ba4167a5
you just have to send those files into the recycle bin and then restore it, good luck