Use VLC player – http://www.videolan.org/vlc/
Play DVD's easily
Open Windows Media Player, select the optical drive, press Play.
Windows Media Player should handle dvd. Right click it and choose, "open with windows media player".
Use the VLC Media player, and check that your dvd writer is working well or not.
download and install it, it's one of the best players out there that is free.
you c an then use it to either open disc/dvd when you open VLC, or just drag and drop the the disk/folder from the computer folder (located in the start menu) when you put the DVD in, or select it from the autoplay menu.
Either try harder or go to windows xp (revert to windows xp)