Okay I've restarted & tried all the suggestions. when I put the DVD in the choices are: Play DVD movie using Windows Media Player; open folder to view files; and A red circle that says take no action.
I've looked through All my programs, and it doesn't look like there is anything else that would play a DVD.
I'm using Windows XP 2002 Home version, and my computer is an AMD Sempron, when I look at the properties of the drive it shows; Lite-on DVDRW SOHW-1673S
I have the Windows update every morning.
Any more suggestions? thanks!