An easier way is to put a blank floppy into your computer..
go to 'My Computer' and right-click on the floppy drive.
Then select format and choose to 'create an MS-DOS startup disk'.
after the format, copy the flash utility and new BIOS onto the floppy. (you will probably need to extract the file you downloaded to a folder on your computer and then copy all those files, except the original download.) to your floppy.
now you can boot on the floppy and flash.
(Check the website where you downloaded the BIOS from... it has instructions for all of this.... you need to read them!)
-Sid