HDTV on my computer seems slow. Help!

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I was watching movie trailers on apple.com on my girlfiriends DEll 9200 laptop or something. We were able to watch the HD trailers on 720p and they ran perfectly.

Then, when I tried to watch them on my computer which I built the 720p definitely looked slow. The framerate seemed to be hurting whereas on that 9200 it was fine. I can't imagine that her Dell outperformed my desktop. I have more RAM and probably a better video card.

I am very lost when it comes to HD on a computer. Can someone tell me based on my specs below what may be the problem?

If this is the wrong forum I would gladly repost it somewhere else.

 

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What are the CPUs on the two computers?

MY 3200+ is running at 2.21 ghz.

 

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I think its a HT P4.

I didnt even attempt 1080. But I'm really confused as to why 720p is very choppy.

 

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Kevin,

Yeah, could be but I keep my system pretty tight. No spyware and most of my software and drivers are up to date. So this is really bothering me. I'm pretty sure with the processor and vidcard I'm using that everything should run fine. So frustrating.