You can reflash the bios of your dvd-rom so it 
is RPC-1 (which means you can set the region with 
a 3rd party free app), or you can download 
something called DVD Region Free.  Contact me if 
you prefer the latter.  If you want to flash your 
dvd-rom's bios, check out www.firmware-flash.com 
to see if there is a RPC-1 rom for your dvd-rom.