Hmm. Well I have a laptop but, I can't use it right now.
(charger died.)

You need to install the dvd-player software that is inside
the dvd (don't remember the name) Normally the installation
should launch as soon as you insert it into your drive. But
that depends on your configuration. Also, of course, you
need a DVD player, most computers have one nowadays. If it's
a dvd player, it should have a "DVD" logo on the front...

Like Nagaina said, most computers do NOT come with a dvd
rom. There is a space for one, but they don't come with it. You have to buy and install one. Laptops have them,
atleast they should, mine does. I don't remember price
ranges though, I got the one I had for my PC as a gift.
They're relatively easy to install as well, you could probably do it by yourself

Isn't it plagiarism? I don't think you can rent to rip I
think It is Illegal. I'm not sure. Anyways, depends how old
your computer is. You can download DVD players though.

I duno, but i own a copy of balto 2 on dvd and i have a dvd
-rom drive and still says the same thing for me too >.

Oh!I have Balto one on a VHS and Balto two and three I have
on a YouTube...

(nothing about comuters that is...hehe...)

No, not ALLcomputers have DVD-ROM Drive...
But I
know nothing so pay no attention to me...