My US bought laptop's DVD had region coding enabled. A little bit of research at
www.rpc1.org soon fixed that.
Now it has no region coding at all.
Did the same for a colleague's UK equivalent model too.
Note: Some DVD drives are problematic when it comes to removing region coding from them. Make sure you check the exact model number of the drive when you browse at the computer shop. The salespeople won't have a clue but you can often get it via Windoze control panel. Alternatively bring a USB key with one of the purpose built softwares that can do this. Some of them will also tell you whether the drive has region coding enabled.
I can email one ('DVD region info' or 'drive info' or whatever it's called) that I got from rpc1.org if you like.