a dvd+r booktyped to dvd-rom is NOT the same as a regular dvd-rom. changing the booktype only helps if the player is normally able to play dvd+r but refuses to play the dvd+r booktype. if the player is simply unable to play dvd+r, then changing the booktype won't help. however, with that being said, i've found dvd+r booktyped to dvd-rom to be more compatible than dvd-r.
please do a search next time before starting a new thread. questions like this have been answered many times before. also, this forum is for questions related to dvd movie backup software, which this thread has nothing to do with.