iTunes freezes on my iPhone 3GS - and I can't reinstall it!

Have you tried closing the iTunes app completely and seeing if it works ok when you re-open it ? From the home screen (i.e. not with iTunes 'open' on-screen) double-click the home button to bring up the taskbar, then press and hold any of the apps on the taskbar for a couple of seconds or so until they start shaking, then press the '-' in the top left of the iTunes app to close it, and touch any part of the screen above the taskbar so as to stop the shaking and close the taskbar.

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If that doesn't work then you could try a reset : press and hold both the sleep and home buttons for about 10 to 15 seconds (ignore the red slider), after which the Apple logo should appear - you won't lose any content, it's the equivalent of a reboot.

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