Nero Won't Burn - help.

I have Ahead Nero (Disc labeled Nero 5). Everything works fine except for the burning process. It won't burn straight from my DVD RW drive. It saves it to the HD first, and even then, it won't burn from my RW. So all I have are .NRG files sitting around and so way to convert them to ISO's. I tried using DVD Decrypter ro write them as an ISO to my DVD, but it doesn't work. It bnurns it, yes, but it won't let me play it on my PS2 (it's the Snes Station thing). Can someone help?