okay i have a game. i made a iso of all the files on the DVD and now th iso is on my desktop. i but in the dvd intot my burner and now i dont know what to do. so i just open nero up and drag the iso onto the screen and burn the .sio file or do i use a program and extract all the files from the iso then burn those files onto a dvd?

There is a "Burn image" menu on Nero...

open nero, click open, choose image files, choose your iso, DONT change any other settings, and burn.