Media Player- no sound

[Guest]

When I try to play a music file on Windows Media Player, a little red and
white X appears beside the song information and a message pops up saying
"Windows Media Player cannot play the file because there is a problem with
your sound device. There might not be a sound device installed on your
computer, it might be in use by another program, or it might not be
functioning properly." I haven't installed anything at all lately; this just
happened randomly. Any suggestions?

 

[Guest]

"Windows Media Player cannot play the file because there is a problem with
your sound device. There might not be a sound device installed on your
computer, it might be in use by another program, or it might not be
functioning properly."

This is the message i'm getting and i've tried everything. Would appreiciate
any help.....