Limewire is a safe program that is used by many. Perhaps it was something you downloaded or something unrelated but im fairly sure limewire is being falsely accused for the crash of your dell. Mac’s run on a different operating system (not XP like most of the world), but other than that can be used like any other computer and limwire should work on it. If your concerned about download safety only dl mp3 or m4a files from limewire, in other words music files.