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You can download iTunes for free from apple.com/itunes/download/. Click the "Download Now" button. iTunes will start downloading. Uncheck the boxes if you don't want email from Apple. There's an Email Address field, but you don't need to enter your email address to download iTunes. If prompted by Windows, click Run to allow the installer to start. You have several installation options available to you. All of the options are checked by default. Uncheck them to disable them. You can add an iTunes shortcut to your desktop. You can use iTunes as your default player for audio. You can have iTunes automatically update itself. You can choose the iTunes language. The default is English. You can choose the installation folder. The default is C:\Program Files\iTunes\. When the installation is done, click Finish. If you leave the checkbox checked, iTunes will open immediately. If you don't want it to open, uncheck the box. The first time you open iTunes, you'll need to agree to the iTunes Software License Agreement.
Visit the iTunes website. Download the iTunes installer. Run the installer. Follow the prompts to install iTunes. Launch iTunes.