Multimedia audio controller problem

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hey, im new and i don't know what happened but, i restarted my computer and when it started up again, i get a message saying "new device found, multimedia audio controller" i realise i have no sound, and when i check it says no sound device found.
I try automatic install but it says it cannot find any hardware from the internet, and i dont have a cd for my sound system.

im a noob at hardware, all i know about my sound is that it is Altec Lansing 221.

and all i know about my computer specs is that it is
Microsoft XP media center edition version 2002 with service pack 2 installed
and that it is a Hewlett Packard Pavillion

please help me, 1: how to check my computer details, 2: help me get my sound back
 
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