0xc0000005 is the only code that microsoft cares to give in this case. i do not think it is a random occurrence as it happens every time precisely at the same stage, the final stage, of the upgrade from 2k3 to 2k8 (completing upgrade).
it is some access violation or denial, but where? i have tried everything i've found online: updating from a hd instead of cd, exchanging memory from another computer, changing from ahci to sata in bios, to no avail.
thanks for the help.