You can download iTunes from Apple.com/itunes/download. The download page will automatically provide the correct installer for your operating system. If you have an older version of iTunes installed on your computer, it is recommended that you uninstall the old program before installing the new one. Click here for instructions on removing the old version of iTunes. You can usually find it at the bottom of your browser's window, or in your Downloads folder. Follow the prompts to install iTunes on your computer. During setup, you will be able to choose if you want iTunes to become the default player for your music files. This isn't strictly necessary, but can help alleviate minor issues you experience after installing new programs. When you launch iTunes for the first time, you'll be greeted with some welcome messages. Close these to begin using iTunes.

How would you rephrase that briefly using Vietnamese?
Tải phần mềm iTunes từ trang web của Apple. Gỡ cài đặt phiên bản cũ. Tìm chương trình cài đặt đã tải về. Chạy chương trình cài đặt. Khởi động lại máy tính sau khi cài đặt. Khởi động iTunes.