When updating iTunes to the latest version, some Windows users receive a message “iTunes has an invalid signature, it will not be installed”. Apple Software Updater may also not notice that iTunes is already updated, so it keeps on initiating the installation process.
There is an option that will most probably help you resolve your problem.
Remove and Reinstall iTunes
Before starting the process, unplug your iPod or any other iOS device from your computer. Quit Microsoft Outlook.
- Launch Programs and Features. You can do it by typing Program in the search box after pressing the Windows button, or by finding it in Control Panel.
- Then remove the following items: iTunes, Apple Software Update, Apple Mobile Device Support, and Bonjour. Do the same with iCloud and MobileMe if you have them.
Note: Apple Mobile Device Support and Apple Application Support may be difficult to uninstall. Try deleting them again when everything from the list above will be gone.
Alternatively, you can try the second option: Microsoft Troubleshooter. For this, go to support.microsoft.com, click Download. Open the downloaded file and follow the instructions. It usually eliminates the issues preventing programs from being uninstalled or updated, and unblocks Control Panel.
Also, you can use Unlocker or Autoruns utilities to detect processes that make apps impossible to uninstall. If you do not want to look for any third-party tools, try restarting in Safe Mode and delete unwanted programs and folders.
- Reboot your computer.
- Check if the following folders still exist on the C Drive and delete them:
- Program Files\Bonjour
- Program Files\Common Files\Apple
- Program Files\iPod
- Program Files\iTunes
- Program Files (x86)\Bonjour
- Program Files (x86)\Common Files\Apple
- Program Files (x86)\iPod
- Program Files (x86)\iTunes
- Check if there are no shortcuts to iTunes or other Apple software left in the start menu, taskbar on your desktop or other folders. Use a search panel to find them.
- Go to com/itunes/download and download the iTunes setup file (available for Windows 7, 8, 8.1, and 10).
If the downloading process fails, try removing your browser’s cache and changing pop-up blocker settings. You can also click the Download button while pressing the Ctrl key or use another browser.
- Launch the installer after the download is completed.
- To install iTunes, use your account with administrative rights. Right-click on the file and choose Run as administrator. You can also use Shift + Ctrl combination for this option to show up. This helps disable your anti-virus software for some time, so it does not hinder the installation process.
Note: If iCloud Control Panel is not reinstalled automatically, go to apple support. There you can download iCloud for Windows 7, 8, 8.1 or 10. (Windows Vista is not supported anymore).
Important: back up all the files from your iTunes library. Since it probably contains a lot of files, it would be inconvenient to store them using external drives every time you want to update iTunes. If there is still no backup tool on your computer, try SyncToy, a freely available utility.