Well it sounds like it's not a region 2 DVD, in which case you need to either change your DVD player for a multi region one, hack the DVD player so it will play all regions DVDs or just forget about playing it. if you post the full model of the DVD player somebody will see if it's easy to hack the DVD player.
Incidentally, you've now changed the region of your computer DVD drive so next time you put a UK (region2) DVD in it's going to ask you to change it again, you only get 5 changes of region in total before the drive is locked to the what ever region the 5th change took you to, so I'd suggest changing it back to region2 and then don't ever change it again.



