Windows media player problem

if i want to hear a song through windows media player am getting message as there is a problem with my sound device .there may not be sound device installed on your computer it may be use by another program,or it may not be functioning properly.

am using intel pentium 3 and rite now i dont have that mother board cd.
Which sound card i should instal so that i can continuously hear the song.

Already one name is mentined with my sound card.Creative labs CT 4830.
BUT if am starting to download it i could not be able to do .please give me the solution.