Re: video not working, but sound is
couple of things to try. Your not using anything like windowblinds are you? i do and i have to disable it to be able to see the video, sound plays fine but not the vid unless its unloaded. U cud also try VLC player, its a great freeware video player, plays pretty much everything out there, when other programs dont work i can always fall back to this and its great.
To play DVD's u need a software player, like cyberlink powerdvd or windvd, i think vlc plays DVD and thats free. if ur not sure whether or not the codec is 100% the right one, u cud try downloading a codec pack like K-lite mega codec pack. it has everything u need.