No audio

Have XP loaded but cannot get sound. Need to step it out and have started with control panel but so far, no luck. Before computer crashed and son installed new verison of XP, was working fine. Can get sound on skype phone, but I think that has its own built in sound process?

Anyone have skype audio who could talk me through what to do?
cheers
John:confused:

Check devicemanager and there if a soundcard driver is already installedÔÇŽ