Ripping probs

trying to copy three dvds all originals.
two are bo selecta 1+2 both using nero recode 2 but after the initial scan of the discs the copy is too large to fit onto a 4.7gb disc. i dont want to cut bits out i need the whole disc. any ideas?
the other prob i have i with x men on the initial scan lots of red sectors appear in the compression graph and then it wont read the disc at all at the next stage. the disc wont copy with cloan dvd either that gets to 97% then stops. if i try to peview the disc on cloan dvd all i get is tc 110 picture viewer on a black screen and nothing else.
the disc wont play on the pc with win-dvd either.
any help please.
its doin my head in…
thanx
jiz