Random CPU spikes while playing a music video

I'm using Quicktime 7.6.4 on XP Home SP3 to play music videos I got from ITunes. I'm using an AGP Nvidia 7600 GS with 256 MB of memory so it finally draws fine without half-frame refreshes but now I have a new problem. I only have an athlon 64 3200+ in my socket 754 board. It's the third fastest one they make for this motherboard but still, not exactly the quickest in the world. Playing a video in Quicktime only takes like 45% of the processor though so I thought it was fine for smooth playback. But randomly while playing any of these music videos, the CPU spikes to 100%, 95% of it being Quicktime's process, only 3% hardware interrupts so I know it's not a driver issue, and the whole computer locks up for about 3 seconds. Video suspends playback followed by the audio. Then right after that, playback resumes like normal. It can do it in the middle or end of the video or pretty much whenever or even not at all sometimes.
I've updated the BIOS, all related drivers, XP itself, and there's about 55% ram free whenn it does this so needless to say, it seems to be Quicktime's problem, not my computer. Even the voltages are good and also it doesn't lock up any other time using any other software, even VLC in dual monitor mode with direct X as the renderer.
So does anyone know what causes the sudden CPU spike? Is it running out of video memory so it has to ask the CPU to address more all at once or something? Or is it just calculating something that requires tons of resources and my computer isn't fast enough.
The only other unusual circumstances are that I have it configured to play on monitor #2 (which is actually a projector) while fullscreened and then as soon as it's done playing, it snaps back to the original monitor the quicktime window was opened on. It's really smooth and professional looking seeing as how my desktop background is black. I just hit control F, it plays with the video control overlay disabled, and then when it's done it goes back to black and they never see the quicktime window itself. So that's my current configuration in case there's some sort of known dual monitor issue. Either way, I need this thing playing videos smoothly ASAP! So does anyone know how to fix it?

I have the EXACT same problem and I have yet to find any
resources on this subject. It's as if flash videos and games just
decide that they will rebel against my computer every 30 seconds.
I've also closed down all other programmes, and with a dual core
1.6 ghz processor in addition to 2 gb of ram, this
should not be a problem, but surprise surprise it is.
Someone here at adobe has to have a clue as to what is going
on.

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