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Digital Digest -> DVD Digest
Not all DVD-ROM drives can be made region-free, so don't be alarmed if you can't make your DVD-ROM drive region-free (there may be other ways to playback DVD movies in other regions). But if you can make your drive region-free, then you should, since it will save you a lot of trouble.
You can first try the DVD Region-Free or the Pro version of DVDIdle, which claims to make all DVD-ROM drives region-free, although since my DVD-ROM drive is already region-free, I could not test for sure.
To make DVD-ROM drives region-free, you'll have to use a region-free patched firmware to replace the current firmware in your DVD-ROM drive. Please remember that firmwares are the very important piece of software that controls how your DVD-ROM drive operates, and that firmware designed for one drive will almost never work on a firmware designed for another drive (unless the drives share the same basic design, eg. some Aopen and some Pioneer drives). Also, updating the firmware can be dangerous if you don't know what you are doing, as a bad firmware flash can permanently ruin your drive (not to mention void your warrantee at the same time).
Please refer to this page to see a list of region-free firmware for DVD-ROM drives. For the lastest firmwares, or if your DVD-ROM drive is not listed on the list, then please refer to The Firmware Page. Each firmware will have different uploading/flashing instructions, so please read the included documentations very carefully.
After you have applied the region-free firmware, you should use the instructions outlined on this page, to see if your DVD-ROM drive is now region-free or not (ie. whether the firmware has worked, or not). You should also let Windows re-install and re-detect your DVD-ROM drivers and also re-install your software DVD player (more instructions below).
If your DVD-ROM drive is not listed on either of these pages, or is listed as having an RPC-2 (region-locking) firmware only, then you may want to try to rip the DVD to your hard-drive, strip out the region information in the process (to make the ripped movie region-free), and then playback the movie on your hard-drive. For more information, please refer to RipHelp's DVD Ripping Guide (use the "Rip the Entire DVD" section).
So to sum up, this is what you have to do :