I can't find my dvd on my laptop in windows 7?

Try the free VLC Player.

Look under the icon that says my computer and see if you see the DVD player there if you don't what has happened is somebody has inserted a DVD into your player in the past and then inserted another one right on top of it and now you have a DVD player that not only won't detect anything it won't show up and you're going to have to take a pair of needle-nose pliers and shine a light through that little door and pick out the stuck DVDs which is probably going to ruin the disks itself but after you get stuck disc out your DVD should work but look in my computer and see if you see it there and if so right click on it and tell it to run and by the way Lenovo DVD players are $15 on eBay just put your model number in on eBay and order one they're very easy to replace unscrew the two screws on the bottom of the laptop and the whole DVD player comes out as one piece slide in the new one and put the two screws in if the DVD player is too damaged to repair