1. go to device manager & check for any yellow sign.if ther there,that means that u dont have drivers installed or they r corrupt.
2. make sure u can detect your card,now for that u may use a software call everest or stil use device manager under other devices or sound.
did u fix that sound problem?
ok i think u fixed.am going to leave this room and find other problems to fix in other rooms.that is if u fixed yours.am using a cell phone so am a bit slow & i dont get instant messages.
however,i still have to help u.anyway,check for the yellow symbols in device manager.also if yo card is a pci plug-on make sure it well pluged in by opening your box.but if its on board,make sure that there r no IRQ conflicts, u do that in device manager.