And, to answer your second question, what DE you get depends on which .iso you download. I happen to have a copy of the current Xfce image here, and its name is Fedora-Xfce-Live-x86_64-1.5.iso. Each of the spins has the name of its DE in the name, except Gnome, as that's the default. I hope that this answers your question. If not, please respond to this and I'll see what else I can do for you. In any event, I hope you get everything working to your satisfaction.