(HD).m4v wont play smoothly in iTunes or QuickTime Player

Hello,
I have purchased an episode of Lost from the store but it wont play smoothly in iTunes or in QuickTime Player. Any ideas how I can overcome this?
Thanks.

Here's what you need:
Macintosh Hardware
Mac computer with an Intel, PowerPC G5, G4, or G3 processor
Screen resolution of 1024x768 or greater
Playing videos purchased on the iTunes Store requires a Mac computer with an Intel, PowerPC G5 or 1.0GHz PowerPC G4 or faster processor
*Playing HD-quality videos purchased on the iTunes Store requires a 2.0GHz Intel Core 2 Duo or faster processor*
512MB of RAM; *1GB is required to play HD-quality videos*
Playing videos also requires at least 16MB of video RAM

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