ITunes video lagging horribly

I've been having this problem for awhile now: Whenever I try and play a video in iTunes - be it movie, TV show, music video, or video podcast - the video lags. The audio often works just fine, but the video is choppy, as if I'm watching a slideshow or a series of pictures rather than a video. Video works fine on the internet, and in the majority of my video players, it does as well. Please note that I am only trying to play iTunes bought videos in iTunes - the videos have not been tampered with in any way, so there should not be a problem there.
I am using a Windows XP Pentium 4 CPU, 1.50GHz. I have 512 MB of RAM on the computer. It is not a new computer by any means, but it is also not terribly old. I have had this problem with several other videos in unrelated video players, but that is due to a codec issue that refuses to be solved. Besides that, other videos work fine. It is only iTunes videos that are not playing.
Someone please help me figure out what's doing this or how I can fix it. Or if I can fix it, if it comes down to that, because this is getting seriously annoying.

Just updated iTunes to most recent version. Now I'm getting jerky video playback in BOTH iTunes and QT Pro (latest version). CPU use is very high but random; ditto with video playback (i.e., doesn't hang up on the same scene/time).
I had this issue a little over a year ago after updating iTunes to the then latest version. Got nowhere with Apple's "Service" texts. I played around with configs for a while and also re-installed iTunes. It has worked fine until yesterday (same symptoms as last time). As for the past "fix": nothing I can hang a hat on. Methinks Apple updated the version I re-installed with (tho' the version # was unchanged).

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