ITunes 6 makes all audio and video on PC scratchy/jerky

This is for a friend: since updating to the latest iTunes on an HP laptop, all audio in all apps (iTunes, Windows Media, Quicktime, system sounds) is scratchy and all video is jerky. Everything. Every application. Everything is a total wreck. Quicktime settings are correct according to apple "support" documents. No idea what's wrong. Anybody have any ideas?
Win XP, current version, iTunes 6.0.1.

hi John!
if you're getting a problem with
b everything,
first try steadily checking through your sound card drivers, video card drivers and directX. see:
http://docs.info.apple.com/article.html?artnum=93610
... and:
http://docs.info.apple.com/article.html?artnum=60765
... and:
http://docs.info.apple.com/article.html?artnum=300252
keep us posted.
love, b

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