Not all laptops can use software to play multi region DVDs, however. Some DVD drives/operating systems have the region coding hard-wired into the DVD player itself - if this is so, can only change the region code five times (total), and software won't bypass it.
If software does work, I second VLC - it's free, it's reliable, and it it plays a wide variety of different formats (not just DVDs).
If it doesn't, the easiest thing to do in this case is to buy an external USB DVD drive (but don't buy an Apple one!) and plug that in. I have an LG brand that works well.