Robin Hoods Playground

How do I check and see what kind of motherboard and what model am I using? I just reformatted my computer and I'm not getting any sounds. I get a yellow error sign in device manager next to the C-Media AC97 Audio device. I've tried everything from updating from microsoft to using the K lite codec. No luck. What could be the problem. I dont have the motherboard disc.
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you dont have the audio drivers installed.

Try going to the support section on the manufactures website for the audio driver