Chipset patches ? my Orange friend ....

The absence of anything in the mulmedia section says that the onboard isn't correctly 'found' .. despite what device manager seems to think, as you no doubt know by now AC97 'onboards' are probably the worst thing to get installed correctly.

Why do you think the board has SIS 7018 ...? That describes a particular onboard sound chipset configuration that as far as I can see isn't applicable ... Here are all the drivers for your board, try all those & see if that straightens this out.