A choice for you RE How to Play DVDs on your computer
If you have Problems Playing your DVDs in Windows Mediaplayer,Realplayer or even VLC getting "DVD Driver missing" Messages,.Distorted pixellated Pitures and Bad Sound with VLC
Here is a Workaround and Restoration of service to VLC (Can be considered as 2 tips.)
I Spent best part of 2 whole days trying to fix this, Firstly Reloading/Installimg the Progams with no joy reinstalling the Graphic card drivers DITTO!and of Course the DVD player Driver as well which Both were showing as running Normally In the System Information menus
NO DVD driver Showing
So I have a Surf around (pretty deeply) Looking for DVD drivers but I was getting Hits back that I had to pay then I switched to "Free DVD Drivers/decoders"...Again not too much luck
then in the Corner I saw these words
Media Player Classic 6.4.9.1 Which is Windows MediaPlayer Cut right down to the Basics (In an non Works version)
And is only 1.93 MB in download size! And I downloaded this on Filehippo (Albeit pushed well down the list) And I discovered it has to be Run directly from the Zip file every session! Be aware of this (No install!) Fits on a Pen drive if you have one?

Moment of truth .Yes, it did play my DVD first go.All the Features worked too, re:subtitles/Languages/ Picture Aspect .Like VLC on the Menus (Who copied who?)

Talking about VLC if it does Not run or Plays badly DO Not uninstall
The Menus are a Mine Field
But the Video Setting Has NO Default preset setting Hence the Bad Picture
To rectify, open the Start Menu. Click VideoLAN > Quick Settings>Video
In the next menu, there is a big choice of Video Mode Settings I chose OpenGL as my SLI graphic cards /monitor I can run a high quality screen
If I have lower spec computer graphics I would opt for DirectX. and maybe add(no Hardware acceleration) if it was a very low spec machine
Once chosen It does remain Set
Is running 100% again Now....RealPlayer & Windows Mediaplayer still None Op!(On Video)
VLC is an almost 14 MB download. Quite a lot more to discover
Can be downloaded from Filehippo.com or www.videolan.org

As for the Other program, that is downloadable from http://sourceforge.net/projects/guliverkli/
If you cannot locate it on Filehippo

Tech Note It works in "DirectShow" Video Mode only.

VLC uses DirectX, Direct3D and OpenGL modes (DO experiment!) Differences are very minor(If any?) If your Graphics card can deal with that mode

The Better of the 2 if you have a Laptop, or a basic Graphics machine would be the Media Player Classic
PS Does anybody know the Minimum Running requirements for this Program?

PPS They both will play any DVD Video "region" without asking for a code (and eventually locking )