Apple AUSound Isolation Pinwheel error

I launched premier pro on a mac computer. Once on the login screen, premier pro's sound plugin opened a window that read "Apple: AUSoundisolation" with a loading bar at 100%. The screen froze and the pinwheel icon appeard whenever I hovered over the open window. Having forced quit the sound plugin, Premier Pro became really slow and whenever I'd type a letter of my email to login, it would freeze momentarily then display the letters many seconds after I'd typed them. The applcication is not openning whatsoever, please help!