I have the same problem integrated sound card
VIA VT1618 @ VIA VT8237A High Definition Audio Controller
(that says everest)
and my motherboard is
MSI P4M890M-L/IL (MS-7255)
Driver was good for XP, but now I have Win7 32bit, and cant find driver.
Win7 automaticalu find some drivers and i can hear sound but there is no hd deck, where can I find options and turn on line in jack to hear sound on to my headphones. Now for line-in says (image)

but i can hear anything on line in.
There is option for line-in>propertis>listen>liten these device, but i dont hear anything.
Or can that be done with some diferent than via, audio manager.