Recently all of my downloads have been in quick time. My folder for limewire downloads is an Itunes folder, and all downloads use to use and automatically launch itunes. how do I control that preference?

If you're in OS X you can select show info from the file menu, open with application, choose itunes and change all. In OS9, I'm not sure, but I think you can go to the itunes preferences and choose set itunes as application for internet playback.