DVD wont play movie

I just bought a Liteon DVD drive, got a couple of DVDs and tried them on the player but neither movie will play. When tried with Power DVD, which came with my player, it says incorrect region code. My DVD region code is for the US and Canada. I download and tried a program called Direct DVD and it at least got to the FBI warning before going to h*ll. By that I mean it only showed a black screen and wouldn't go any further. In my manual it talks about setting the DVD region code but fails to say how it's done. Anyone know what might be wrong and how to set the region code. I doubt the region code being the problem since I'm in the US and the movies are made to play here. The drives region code shows to be set for the US. I have also tried using DVD Region Killer but that didn't help either.
Thanks
 
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