Apple offers to update iTunesClick image to display full-size
By Ed Bott
The description shown in Apple Software Update says this is an update to iTunes and QuickTime, it doesn't mention any additional software, services, or drivers. But it turns out that the full package offers much, much more than it discloses, including the potential for Windows crashes.
For a more detailed discussion of this issue, see An inside look at Apple's sneaky iTunes 8 upgrade.