Vista - DVD wont restart and then....

We have windows vista home premium and we have a microsoft "PBDS DVD+ DS-8W
1p ATA Device" as our DVD/CD-Rom driver.

When I'm watching a DVD (not one we've burned, just one we've rented) and I
stop the DVD, then try to resume the movie, the computer gets hung up (the
little icon just spins and spins and the drive doesn't even make peep). When
I try to push stop, nothing happens, the icon just keeps spinning. Then,
when I try to eject the DVD, it will not eject and the light on the drive
doesn't blink or anything. I try to use the task manager to end the task and
it doesn't even pop up. I think that I end up having to use the on/off switch
to restart the computer, at which time I can eject the disk. I checked and
it looks like I have the most updated version of the driver. Any clues,
anyone? Thanks!