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After completing the iTunes upgrade, I opened the System Restore dialog box and looked at the list of available restore points. I expected to see an entry for iTunes install. Instead, as you can see here, the installation is listed as a "Device Driver Package Install" of Apple-branded USB controllers. (This driver file, Usbaapl.sys on 32-bit systems, is installed in the Common Files\Apple folder.) Again, nothing in the documentation disclosed or asked for permission to install a device driver.
For a more detailed discussion of this issue, see An inside look at Apple's sneaky iTunes 8 upgrade.