problem with tutorial dvd
 

it worked at first but now i cant see anything when i play the dvd. the video is black but i can hear it. it did work fine but now it dosen't i know it'll be a problem with div x or real player but ive downloaded the newest version of both and it still wont work.

I'd like to think the DVD's are divx encoded, but I havn't purchased any from here so I can't be sure. But you are missing a video codec which is why you cannot see the video. Try downloading flv player, as it comes with a bunch of codecs and plays just about everything just fine.