AMD 64 / Asus motherboard / Nvidia for Vista update

I checked my x86 RC1 event log and see a lot of errors related to ACPI in
PCI slot 11, 13.
I went to dev mgr to disable ACPI - not an option when I right-click.
SO I then went to ASUS and Nvidia to check for updates and to be honest I
don't even know what's what anymore. DO I need to update from ASUS or
NVIDIA - anyone else done this ?

I've got a ASUS A8N-E motherboard with AMD Athlon64 that came with an Nvidia
CD due to some onboard Nvidia stuff. I went to ASUS and I see references to
Win2003 - is that Vista ? ( their website is useless).

I go to dev mgr - view by connection - expand my pc - then expand ACPI then
MS compliant system and I see a lot of Nvidia Nforce stuff listed. At
Nvidia I did a search for ASUS - no hits for my motherboard, but I do see
Nforce software listed but which version ?
I went to http://www.nvidia.com/page/nforce4_family.html
There is one that is NVIDIA nForce4 ( no Ultra, no SLI) , so that's what
I'll try but anyone else have a better way of doing this ?