all flashing bios consits of is going into dos mode, and running an update util (for the bios type of course) and giving it a path to a .bin (binary file), and it would tell you if it wernt successful, but i know on the new MSI mobo`s (lol cwk) and the K7 series has a program that runs in windows to do it, but it it goes wrong you system may not boot, which can be rectifyed by clearing your cmos, and resorting to the factory default settings (if nothing was damaged= dead mobo )

so
1.find out your motherboard
2. goto the site and find specs
3. or if they offer the bios tools DL em and the latest flash

(flashing bios`es used to consist of shining light into a glass place, as the components were light sensitive)
(just a bit of usless info, incase u wanna impress neone, i done it too many times to count)

Preep