I have a problem trying to play DVDs on my laptop. When ever I try, I get the following error from Windows Media Player:

Windows Media Player cannot play this DVD because there is a problem with digital copy protection between your DVD drive, decoder, and video card. Try installing an updated driver for your video card.

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Where can I get the updated driver? It's a Gateway computer I bought in February.
I run Vista...

Go download VLC media player.

http://www.download.com/VLC-Media-Player/3000-13632_4-10267151.html?hhTest=1&tag=lst-1&cdlPid=10852842

It can play everything, including DVD's. I'm not kidding when I say everything, and it is a very highly rated program, despite it's non-flashy looks. Trust me, it'll work. Cheers.

whats the model number of the computer?

Get VLC Media Player. Comes with all the codecs for DVDs, blu-Ray, etc.