Problem in sound driver. sometimes when i start media player it displays this''windows media

Question

sometimes when i start media player it displays this''windows media player cant play the file because there is problem with ur driver.there may not be a sound driver installed in ur computer.it may be in use by another program or it may not functioning properly''but i have my sound driver already installed.whwn i reinstall it ,it works properly.agian after few times problem occurs.

i have problem in my sound card i cant leasen sound from my speaker can you help me plz