Well, I came across something strange. With my AT7, after installing Win2K for the first time (got sick of XP) I originally had my CPU decode set to Normal. After the install of 2K, I thought, why not change it to Ultra. When I did so, I was immediately greeted with an INACCESSABLE_BOOT_DEVICE bsod. I changed it back to Normal, and everything was, well, normal again.
I am using a T-bird 1.333, could it be that these CPUs do not like the Ultra decode mode? or is there something else that I might not know?