New drivers may or may not solve your sound problems... there's no gaurantee. Unfortunately, you'll just have to try and hope (or stick with current situation).
Check out the forums at
http://www.nforcershq.com and especially the nForce Audio & HTPC section.
The nForce 2.45 package really messed up my system's IDE drivers so I had to format and clean install WinXP. I'm sticking with 2.03 for now. Others had great success with 2.45, go figure.
I havn't had any problems at all with SoundStorm with either the 2.03 or 2.45 UDP so it doesn't suck on my system, but results vary. I've read somewhere that an over-heated South Bridge can sometimes cause audio problems. Maybe a heatsink on the SB would fix it on your system?
JohnE.