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QuickTime nag removal:
Install the application (if not already). Set the date on your computer forward 10 years or so. Now open QuickTime and hit 'LATER' on the nag screen. Quit QuickTime and change the date back to normal. The nag screen should be history!
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Let me know if it works, and which OS you're running (Windows XP, 2000, OS X, OS 9, etc.). Thanks.