What 国静 税 is trying to say is navigate to Add or Remove Programs in control panel. Scroll down to PTC Quality Agent, right click it and click repair. Then relaunch Creo. It worked for me, should work for you.
This forum is for Creo Elements Direct (SolidDesigner, Annotation, ME10) - not for CREO.
Please let the Community Admin move this thread to the CREO forum.