Sound & Audio Device Problem

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I have just tried to play a song on Limewire but no sound came out so i checked in my Control Panel and Sound & Audio Devices and it said that there is no Audio Device. Does anyone know how to get this back? I dont know hows it gone but i have just installed Windows Service Pack 2, could this have something to do with it?

Many Thanks
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[Rik]

What pc do you have, we need info to work with you know.

 

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Its a Packard Bell Easy Note

 

[Rik]

Have you tried restarting it?

 

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Ive restarted it a couple of times but no change. I also did a system restore to before i installed the service pack but this didnt work either