I had that problem with my Asus A7V back on nov 2000.
It comes with a nice windows program BIOS upgrade,
hen why not using it, that's what i thought.
It crash and when I call them the said that I should use
the bootable floppy. I finally RMA'ed the mobo.
But it still on my mind until now, if we're not supposed to
use it or it it's just for expert. then why did they put
the program on the box .
I dunno if they have a better sofware nowadays but
i don't want to get into that mess again so i always do the bootable disk.
peace