DVD RegionInfo can retrieve DVD region information. DVD Region is a mechanism encoded both in DVD players and on DVD discs dictating if a DVD player can play a certain DVD disk. The DVD region in the DVD player is stored inside the hardware and cannot be reset if windows is re-installed or the player was moved to another PC.
Some ways to circumvent this is to update your players firmware and remove the DVD region support from it. The DVD region in the DVD movie is stored inside one of its IFO file.

The license of this software is Freeware, you can free download and free use this dvd utility software.