My Newish Laptop has developed a problem. HP I5 processor 750GB Hardrive and I think its 4Gig ram????

Apart from my Virtual DJ Software occasionally crashing due to no audio every other app on it does not play audio on eg youtube/facebook and windows media player keeps just crashing.

has anyone got an idea what is wrong. I have check the audio cards and they say they are working correctly.

cheeRS in advance.

Ben.