Help me upgrade my BIOS

Help me upgrade my BIOS for my mercury PI845GLM-AGP MOBO

HELP!!,windows xp restarts with a blue screen all of a sudden.
the BSOD says it 's a STOP error and then restarts.

I learned that this was a stop error and the microsoft error analysis web told me to upgrade my bios.
My processor is Intel P4 1.5 Ghz .
My motherboard is Mercury PI845GLM-AGP V5.0. My BIOS is AMI.
so i dowloaded amiflash.com from www.ami.com
i dowloaded the BIOS FILE ENDING WITH .ROM from mercury website.{www.mercury-pc.com}

i inserted a dos boot cd.
and typed amiflash.com
it starts up but says
"no flash support press any key to quit"
what am i supposed to do???????

How do i upgrade if i get the above error.is there another way.