Poor quality playback

Hi,
I have a playback problem with Quicktime 7.0.4 Pro. The playback is very stop/start and quicktime takes 100% CPU time. The movie is an HD clip from my hard drive. The WMV version plays fine in windows media player. I have tried playing in Zoom Player and J.River Media Center with the same result, so the actual quicktime components on my system are taking all the processor time. PC is an AMD 2.5Ghz with 1G ram and 6800GT graphics card so it should play fine.
Any ideas?

I just upgraded to iTunes 7.1.1 last night and suddenly iTunes is MUCH slower launching songs.
Before I upgraded it was frighteningly fast; double-click on a song and the song started playing immediately. Double-click another song and that one started instantaneously also, as if iTunes seemingly had the hard drive perfectly mapped.
Now when I click on song it hesitates for 1 or 2 seconds before starting to play.
A little weird.
I also upgraded from 10.4.8 to 10.4.9 last night so perhaps it is related to that.

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