Burning Iso's

I need help. Listen, I have a Modded xbox 360,clone cd, a double layer cd/dvd burner,I have dvd dercrypter, nero, and I have double layer 8.5g dvd's. I downloaded a xbox 360 game (mlb 2k7), I extracted the .rar files to an iso file. ( I right clicked and selected the option to "Extract Here"). After that, I got an iso image file that looked like a cd on a piece of paper. I burned (or so I thought) the iso image to my double layer dvd using dvd decrypter, but my xbox keeps saying "Unrecognized Disc". Can someone give me alternate instructions or tell me what i'm doing wrong!!