If that's an award bios, go create a dos boot disk or download one and put the files in a floppy disk. Put the new bios file and the flash utility in the disk as well. Restart your PC with the floppy disk. In the prompt type [name of flash utility] [name of bios file] and click enter.
It gives a detailed description on how to flash the bios and the downloads for the utilities you will need to use. The site also does a great job of explaining the differences between new and old bios and all the other little details in the bios. Anyway, I would definitely check this site out if I were you.