No, use VLC Player to play from any region WITHOUT changing the region. You are allowed to change region normally only five times.
*www.videolan.org/vlc/
DVD-Video discs may be encoded with a region code restricting the area of the world in which they can be played. Discs without region coding are called all region or region 0 discs.
The commercial DVD player specification requires that a player to be sold in a given place not play discs encoded for a different region (region 0 discs are not restricted). The purpose of this is to allow motion picture studios to control aspects of a release, including content, release date, and, especially, price, according to the region. Many DVD players are or can be modified to be region-free, allowing playback of all discs.
You can use AnyDVD also, but it is costly.
To change your DVD region in Vista:
1. Open start menu, right click on Computer and select properties.
2. From the left hand pane, choose device manager.
3. Select your DVD drive, and right on on it and choose properties.
4. Go to the region tab, and change the DVD region and click OK.
You can change to DVD region at most 5 times in this way. After this, it will be locked in the firmware.