If you downloaded a version of iTunes from Apple's website, use the steps in this article.
If you have Windows 10, you can also get iTunes from the Microsoft Store. If you have trouble installing iTunes from Apple's website, download iTunes from the Microsoft Store. If you can't download or update iTunes from the Microsoft Store, contact Microsoft for help.
If you can't install iTunes on your Windows PC from Apple's website, or if you see "error 2" or "Apple Application Support was not found" after you install the software, follow the steps below in order.
Make sure that you're logged in to your computer as an administrator
Install the latest Microsoft Windows updates
To download the latest updates, visit the Microsoft Windows Update website.
iTunes for Windows requires Windows 7 or later, with the latest Service Pack installed. If you can't install the updates, refer to your computer's help system, contact your IT department, or visit support.microsoft.com for more help.
Download the latest supported version of iTunes for your PC
Download iTunes from Apple's website, then click Download to download the iTunes installer. When prompted, click Save (instead of Run).
If you have Windows 10, you can get the latest version of iTunes from the Microsoft Store. If you get iTunes from the Microsoft Store, you shouldn't need to follow the rest of the steps in this article. If you downloaded iTunes from Apple's website, continue below.
Right-click the installer that you downloaded in step 3—it will be labeled iTunesSetup or iTunes6464Setup—and choose "Run as administrator."
If you've previously installed iTunes, the installer will prompt you to repair the software.
After the repair is complete, restart your computer and try launching iTunes.
Remove components left from a previous installation
If iTunes fails to install or repair, it might be necessary to remove components left from a previous installation of iTunes and then reinstall.
Learn how to remove and reinstall iTunes and other software components for Windows Vista or later.
Songs that you bought from the iTunes Store or imported from CDs are saved in your My Music folder by default. Deleting iTunes won't delete your music.
Disable conflicting software
Some background processes can cause issues that prevent applications like iTunes from installing.
If you installed security software and are having issues installing iTunes for Windows, you might need to disable or uninstall security software to resolve the issues.
Restart your computer
After the restart, try to install iTunes again.
Get more help
If the steps in these articles don't help you fix the issue, you might be able to find a solution through a search of the Microsoft support website.