The computer is a Dell Dimension 510. It happens when my 7 year old is playing a game. One of the games is called "Jump Start", it is an internet based learning game. The other one is a cd rom called Lego Rally or something like that. The problem is that with both of these games the audio will hang up and the music will get stuck on one note. The video still works on Jump start, but audio hangs. With Lego, the computer will freeze and parts of the video will be missing. I have run virus scans and spybot scans. The other part that drives me nuts is that sometimes the computer will be slow and the fan will run. The fan will also run at times where I am not using the computer.