The drive speed shouldn't matter. You only need a x1 speed reader to play a movie DVD.
Can you open the disc in explorer?
With region settings, if you put a disc in a player and the region is incompatable, the disc will still read. You will get an error message along the lines of "Incorrect region encoding." I have region 1 and 4 discs (America and Pacific) which I watch on my multi-zone player. My computer only has a region 2 and 4 player. I can put a region 1 disc in it and use the interactive content and read the disc and copy files, etc. I cannot watch the title track though because of the incorrect region setting.
