Bios Flash on Asus P5LP-LE

I have a Asus P5LP-LE (Limestone-GL8E) mobo that came in a Hp m7160n.
specs:
Pentium D 2.8 Ghz
4x1gb Geil pc 5300 667 Mhz
Nividia EVGA 8600 Gt 1Gb graphics card

I am trying to flash the Bios over to a Asus P5LD2. I have a floppyless pc so I have made a bootdisk via cd-rom using Dr-Dos 7. I have intergrated the bios flash files for the P5LD2 into the ISO file via UltraISO.. After burning and booting up I have realized that I have no executable file to write BIOS info onto the CMOS chip. So when it boots I have an A: drive for startup files and a R: drive for my Bios file which happens to be a rom file which i cant run in dos to my knowledge. If there is anyone out there that has been in the same boat or who might have a couple pointers I would deeply apreciate it.