Like Spinner says its a PAL /NTSC thing .The US uses the NTSC format and UK uses the PAL format and unless you have a setup that will play PAL ( not common in US )you're out of luck .You can convert PAL to NTSC a long drawn out proccess that in my opinion is not worth the time and effort .Google PAL to NTSC
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Thanks to all who answered. My wife bought the DVD through E-Bay. the seller was in the UK. It is a ballroom dance teaching DVD and I can't find it here in the US anywhere. So I guess that we're SOL. Thanks again. Greg