if you have directx installed,click start,then click run,then type (dxdiag) without brackets,there you can find the necessary info on your mobo and soundcard(hey thanx for the thread,this reminds me,i have to update my own drivers )
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Goto start > programs > accessories > system tools > System Information.
System Model is your motherboard model. Goto the website of your motherboard manufacturer, find drivers for your motherboard, download and install.
All this, if you've lost your motherboard cd.