It's probably just the driver that is missing. Do you have a driver disk for the motherboard? Have you looked in Device Manager to see if you have a yellow warning triangle or an exclamation mark. If you can supply details of your PC we might be able to help you find a sound card driver.
Before you download from woodchip's link read the small print as below....
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I have tried those "Repair tools" lesson learn't.
Having checked device manager I discovered I have question marks against
MM Audio cont
Device type: Other
Loc: PC1 bus 0 device 2 func:7
Video cont (VGA comp)
VGA: No info.
XP Home V 2002 SP2
Main Brd #E661GXM
Click Here for the official Acer driver site for the SA80 this will give you both the Realtek audio driver and a choice of 3 graphics drivers. However there is a link on this page which says Download Vendor Hardware Detection Utility and if you use that it should tell you which graphics driver you need. good luck
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