DVD decoder

Doesn't one come with XP? I was a;ways able to view DVD's
before, where might it have gone?
>-----Original Message-----
>The only way not to play for one is if you already own
>one. WinDVD and PowerDVD are the two biggest Software
DVD
>players/Decoders. you need to install one of them.
>
>>-----Original Message-----
>>I bought a computer about two years ago which came with
>>Windows XP. All of a sudden I can't play DVD's anymore
>>because of an error message saying that I am missing my
>>DVD decoder. How can I reinstall it without having to
buy
>>one on the bnet?
>>.
>>
>.
>