P6860fx/winxp problem?

ok here's the deal. my 6860fx will not load win xp right. i have two issues. first off there is no sound. i tried downloading all the sound drivers i could but it says my sound card is broken. but with vista and 7 it works just fine. i am really stumped. while i like xp this comp will not play any sound at all. the second problem is internet. i have installed three different versions of xp and i cannot get internet in any way. i have time warner road runner high speed online. with vista and 7 internet launches no problem. i have gotten around the graphics driver issue (custom inf file). i am really stumped. i need some serious help. don't worry i am not new to computers so you speak techy talk to me. thanks in advance.