Basically, DVD are coded into different region codes to prevent,
for example, a American DVD playing on a Singapore machine. This is
to prevent sales lost due to consumers buying a DVD produced from a
different region.
Region 1 is american and region 3 is asian, which is what we have.
If you have Windows Media Player, you can set your region code, but
only a specified amount of time, whereby if bypassed, would cause
the region to lock on forever on the last used region.
I recommend going for region 3 dvd's as they are cheaper and our
player supports them. 
