I'm not sure how you transfered the music to your new computer, but let's assume you moved the entire iTunes folder with the original .itl file. If that's the case, the solution is very simple. Hold the shift key down, and open iTunes. Do not let up on the shift key until you get a window that asks you to choose a library, or create a new library. If iTunes opens without giving you that choice, just close it and re-open it with the shift key down. Nine times out of Ten it works on the first try. Click "choose a library". You will get another window that allows you to navigate to your hard drive and show iTunes where your music is stored. In a folder called iTunes or iTunes Music, choose "iTunes Library.itl" This should bring back your entire library exactly the way it was when you last used it. Understand that while all of your music is stored in your music folder, information is stored in the .itl file.