Does the drive work with other dvds? Try a commercially made movie in the drive and try playing it with VLC media player. www.videolan.org It is free to download and use.
If the commercial movie works, you know that the drive is capable of reading dvds. And really, you don't even have to play it, you could simply right click on the icon for the drive and click Open. It should show a Video_TS folder, and that will show that the drive is actually reading the disk.
Assuming that this test is successful, you may be looking at a poorly burned disk, or a drive that isn't particularly good at reading burned media. You can try cleaning the lens of the drive and see if that helps.