I think what happened was he accidently deleted the driver.
I have downloaded and installed the correct driver from emachines website, installed it and rebooted, but no joy.
I noticed that the windows audio service wasn't running, I have tried to start it but I am getting the following error - 1059 Circular service dependancy was specified.
Plug and Play services will not start either I am getting this error - Service did not respond in a timely fasion
I would really love to get the sound back as I do a lot of audio editing on the machine.