calling all computer nerds.....

i have a old gateway 600yg2 laptop that im trying to get puppy linux onto, but im struggling and this is a little beyond me

ive got the 32bit iso burned onto a dvd-r. the disk drive is compatable and i know it works, as well as the hard drive. its just not reading the disk, even when i select the disk drive in the boot menu

the only thing i can really think of is that i burned the iso wrong, which is possible as im not the most well versed with this

i really want to get this dinky ass laptop working again but i just need some help