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Also check and see if it needs driver updates. Hit up the manufacturer's website and download the latest firmware updates and stuff. As others have said, ensure your drive is set to the right region. And keep in mind that DVD players, like everything else on your PC, is made by mankind and therefore prone to dying for no apparent reason at the worst possible moment.
Also, as a matter of honor, most players refuse to play that Swedish porn crap. Buy Dutch instead.