There’s a lot to iTunes. While its primary function is as a digital music player application, it also enables you to manage a library of music, automate the playback of your favorite tunes, and accomplish other “killer” tasks such as burning audio CDs and loading and unloading songs from an external MP3 player.  Launch iTunes for Windows for the first time.
Once you have it downloaded and installed, the first time you launch the program you’ll be greeted by the iTunes Setup Assistant. Here’s how it works in Windows:
1. The first screen you’ll see is the Welcome screen; click Next after you’ve read the text.
2. The next screen is the Find Music Files screen. If you select Yes, then iTunes will look in your My Music folder for MP3 and AAC digital audio files. Those that it finds, it will place in its library. You can also choose No (by clicking the radio button next to it) and iTunes will not search for music. Click Next to move to the next screen. On the Keep iTunes Music Folder Organized screen, iTunes is asking you if you want to allow iTunes to reorganize the folders and files that you already have stored in your My Music folder. If you already have an organization in that folder that’s important to you, choose No; if you choose Yes, then iTunes will reorganize the folder so that songs are stored in folders by artist, which are then subdivided by album. (If you already have your music stored by genre or by some other system, then you probably don’t want iTunes to change it.) Click Next once you’ve made your choice.
3. On the iTunes Music Screen, you’ll choose whether you want to launch the iTunes Music Store when iTunes finishes launching itself or go to your iTunes Library (the main iTunes screen) instead. Make your choice and click Finish.
That’s it. You’re done with the Assistant. It will take a little time to look up songs in your My Music folder and then to query the CDDB database to get names and other information about those songs. From there, you’ll be taken to the iTunes Music Store or your library, depending on the choices you made.

>> iTunes  launched

Once iTunes is launched, you’re presented with its main interface window if you end up finding iTunes useful on a regular basis, you’ll get to know this window. Unlike some applications you may be familiar with, most of your interaction with iTunes will occur in this window. You’ll occasionally open a dialog box and so on, but as far as managing and playing back songs, that happens mostly in the single iTunes window. - The source list On the left side of the window is the source list, where iTunes stores the various sources of audio you can play back. That includes the main library, where all of your digital audio files can be accessed and managed. (This consists of audio files that iTunes has automatically located, those that you’ve imported, and those that you’ve copied from your CD collection or bought from the iTunes Music Store.) You can also access the iTunes Music Store from the source list as well as from Internet radio stations. It’s in the source list that you’ll create your own playlists for managing your audio files. - The main list when you select one of the sources in the source list, a list of its songs (or stations or albums for purchase) will appear in the main list area. As you’ll see  the lists that you encounter can generally be sorted and searched in a variety of ways that make managing even a great number of songs relatively easy. - Playback controls up in the top left corner are the controls used to play and pause songs, skip through them, or skip to the next (or previous) item in a list. They should look familiar if you’ve ever used a tape recorder, VCR, CD player, and so on. You’ve got a volume slider here, too. - The status area Up at the top of the window, you’ll get information about the song that’s playing and the elapsed time. Just for fun, you can click the small arrow icon to change the status area to a visual representation of the song playing: - The Search box enables you to quickly whittle down a list of songs in the main list. - The Action button This button changes depending on what you’re viewing in the main list. - Playlist buttons The buttons in the lower left corner enable you to create and manage playlists and other items in the source list. It’s here, for instance, that you can set an audio CD or playlist to repeat or shuffle, as you might on a consumer CD player or the player in your car. - Extra buttons On the lower right side are buttons that enable you to access the built-in equalizer, the Visualizer (which displays patterns that are in sync with the music), and the Eject button for opening and closing your computer’s CD/DVD drive.      Play Your Music iTunes can play back a lot of different digital music. Play Songs - If you have a music file already in your iTunes Library after the Setup Assistant has searched your home folder, for instance you can play the song in one of two ways. The first is to simply double-click it in the main list. When you do, a small speaker icon will appear next to the song and you’ll see information about that song displayed in the status area. You should hear the song begin to play, and a small scrubber bar will appear in the status area. That bar can be used to quickly move to different parts of the song just click and drag the small diamond back and forth. Note that you can also click the Elapsed Time entry to see other time information such as the Remaining Time and Total Time for the song.