Sometimes you need to uninstall iTunes and QuickTime because of their plug-in malfunctions, or you want to uninstall and re-install them with different versions to upgrade/degrade your iPhone firmware. But since iTunes and QuickTime have many components that are interdependent to each other, you will find it at most of times that erroneously uninstalling iTunes could cause QuickTime unable to be used, or vice versa. In view of this, uninstalling iTunes and all of its components in a correct order is vital.
To uninstall iTunes and Quicktime, get in your Controle Panel->Add/Remove Programs and uninstall the following components:
1. iTunes
2.QuickTime
3.Apple Software Update
4.Apple Mobile Device Support
5.Bonjour
6.Apple Application Support (for iTunes 9 or higher version)
Beware that this sequence could not be reversed or ignored, or you may get various warning messages that constantly compromise you to uninstall iTunes.
Something you need to be concerned during the process to uninstall iTunes and Quicktime:
All music you bought from iTunes Store or imported from CD will be saved in your "My Music" folder by default. Uninstalling iTunes will not delete these music.
When you completely remove each component of them and get a prompt asking you whether to reboot your computer, click "no". Find and delete any sub-items regarding this component, if there is it.
Navigate to My Documents->My Music->iTunes, delete the file "iTunes Library.itl".
Do not try to delete Mobile Device Support folder in C:Program FilesCommon FilesApple, try to use Add/Remove Programs as mentioned.
If all these steps are done correctly, you should be able to uninstall iTunes and Quicktime successfully. If you experience difficult in finding relatively leftover sub-items, which are sometimes stubborn enough to create a small icon on your Control Panel and launch QuickTime player every time when you click an mp3 linkage, try an application called Perfect Uninstaller. This software deals with leftover files/registry in a way that enables you to forget about all the steps mentioned above. Simply by using Force Uninstall method to delete C:Program FilesCommon FilesApple or C:Program FilesQuickTime, all the relatively sub-items, registry entries and files will be gone through and removed by Perfect Uninstaller within seconds.