Sorry man but
Yes you have write a lot BUT i repeat you think you have explain well but sorry i hav dont understand how to do that :
add "pci=noacpi" to your lilo.conf append string (and don't forget to rerun lilo afterwards)
you dont have explain more
And finally the most interresest part is
disable kernel-support for agpgart driver (then recompile and install it) and enable NVIDIA's AGP driver
but Reread your post and i say its not a newbie step by step how to and you fly over the topic.
If one person can explain step by step how to disable kernel-support for agpgart driver please please write it for us ....
Thanks again and again