Open your web browser and log onto tunebite.com.
Click the red "Download" button located in the center of the page. Run the program when it's finished downloading. Install Tunebite using the Setup Wizard that pops up. Restart your computer.
Open Tunebite once your computer has been rebooted. Click the "Add" icon and then select a file or folder that you want to convert. Select an output folder to store your files when prompted by Tunebite. Click the "Start" button to begin the conversion to a universal mp3.
Open iTunes and access your library. Select "File" to open the drop-down menu. Select "Add File to Library" and then select your newly converted songs from your output folder.