My laptop plays DVDs and VCD but no sound is heard.how do i fix it? ?

Each time i play music stored in my computer,the whole system runs normally but there is no sound.Some massage appears on the sound icon informing me that the audio sound device has not been installed.Please help me to fix it.the computer is a Toshiba model made in the USA.I bought it as a second hand but in its present condition.

okello oyado sam
December 2010