I have QuickTime and iTunes installed also. When I download an MP3 from LimeWire its already in QuickTime format. I'm not sure how help you from here. Maybe you could open your QuickTime settings and go to the pull down menu and come down to Browser Plug-in. From there click MIME Settings there will be an option that says MP3 make sure you have it set to "Do not use QuickTime." After that try to download a song from LimeWire and see what happens. It should download as a QuickTime file. I'm not sure if this will work. Let me know if it works or not. Good luck.