Auto Play Problem In Vista

Hi guys,
I have Vista Running in my computer for long. But today I was encountered a strange problem.
My DVDs in not autoplaying.When I insert a mixed DVD in to my DVD Drive The "DVD RW Drive" shows only the size of the total DVD and free space.When I double click on that it promots "Prepair the blank Disk"to format the disc and gives me the default write option as Vista provides. If I open or explore then also the write option pops out. I've enabled the autoplay options in many ways i.e, "Ask me every time" and also as "Open folder to view files using Windows Explorer".
But if I restart my machine with the DVD inside on the drive then after restart when the computer starts, if I go to the computer and on double click on the DVD RW Drive icon then the DVD opens...And functions perfectly.....

Please help me on this because how many times I restart to get a DVD to run..??? Its very annoying.So please post a solutions.....

I'm Providing some Pictures....Please See them and Help me on this Problem...