hi
I also have the same problem, i have a foxconn mother board i am unsure of the exat make, but on the chip to the left of the batt it says SIS 963Lua, the system was made by someone else but it has a pentium 4 processer (3.00ghz)
with 512ram with a maxtor 40gig hdd, it was running windows xp home but i upgraded this to xp pro, but now i dont have any sound and it never picked up my modem.could someone please help as this is driving me crazy.

thanks.
ps it is a desktop pc.