Why does my Macbook Pro glitch when I'm watching a film on iTunes?

I have a 2006 Macbook Pro, with up-to-date software, and whenever I watch a film on iTunes, it glitches every so often. Why is this?

When I say glitch I mean the video freezes for a couple of seconds, the audio carries on and then the video fast forwards itself to catch up with the audio. It repeats itself at frequent intervals.
The hard drive is 500GB (the RAM is 3GB)
There is about 230GB left
The internet connection is very fast, and in one half of the house it is WPA2, and in the half where I usually watch films, it is WEP
5 machines use this WiFi
Nothing is connected to my laptop when I usually watch films
I am 90% of the time usually running off the mains.
I also forgot to mention, that this also happens when watching a film in iMovie or iPhoto. It only started happening a couple of months ago. I hope this helped.

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