No Audio Device after DVDRW

Hello, hope you guys can help.
I installed a Lite-On DVDRW saturday, all seemed well
on sunday nite, tried playing a DVD Movie thru Windows media player 9
Got a blue screen......
rebooted,my 2.8 Pentium 4 Processer was listed as 2.1 ghz, i believe.
got that fixed by adjusting the FSB..ok
now , everything works except my sound ( AC97 built onto my ABit it7-max 2
ver 2 motherboard.).
IT DOES NOT EVEN SHOW UP IN CONTROL PANEL/SOUND..SAYS NO AUDIO DEVICE.
Tried reinstalling the sound drivers from Abit Mobo CD Rom,,,, no go.
deleted Advance AC97 from control panel-add/remove prog.,,,, no go
Does anyone have any advice to give me???

System Specs:
Abit it7-Max 2 ver 2 motherboard, onboard sound,onboard lan,usb 2
proc...pentium 4 2.8 gig o/c to 3.15
corsair memory 512 meg
windows xp Sp1
lite on CDRW
lite on DVDRW

haven't tried the writers since this crash.Hope they still work.

Again, Thanks for any help

Dan