Cause DVD players function by regions, because many DVDs are imprinted with a code that controls which geographical region they can be played in. To make sure your DVD is using the correct region, see the following Pain Killer.
The Pain Killer To make sure your DVD drive is using the correct region, follow these steps:
1. Click Start | Control Panel | System. These steps assume you are using the Classic view of Control Panel, which shows you all the icon options. If you are not sure you are using the Classic view of Control Panel, click Start | Control Panel. In the left window pane, click the Switch to Classic View option.
2. Click the Hardware tab and click the Device Manager button.
3. Expand the DVD/CD-ROM Drives category. Right-click the icon for your DVD player, and then click Properties.
4. On the DVD Region tab, the current region is displayed. Click a geographic area in the list and look in the New Region field to see the region code of the geographic area you need to use to change the currently configured code. Click OK when you are done.
5. A message appears asking, “Are you sure you want to change your DVD drive region setting to region x?” Click OK.
If you cannot change the code, then your DVD does not support other regions. The only solution is to purchase a DVD-ROM drive for the region in which you now reside.
http://tech.yahoo.com/gd/windows-xp-dvd-rom-drive-headaches-i-receive-a-region-error-message-when-i-try-to-use-the-dvd-player-/3348;_ylt=AmFh.xnOdsvXOkokUUXwuFgSLpA5
