WINXP PRO SHUTDOWN ISSUE

WHEN EXITING OUT OF OUTLOOK 2002 SP1; AND WITH NOTHING ELSE RUNNING.(ALL PROGRAMS CLOSED OUT)
I CLICK ON SHUTDOWN AND OUTLOOK IS STILL RUNNING. IT TELLS ME TO “END PROCESS” SO THAT I CAN CONTINUE TO SHUTDOWN. THIS IS VERIFIED BY RUNNING TASKMANAGER. WHEN CLOSING OUT OUTLOOK; IT WILL NOT CLEAR ITSELF UNDER THE TAB “PROCESSES” INSIDE TASK MANAGER.
ANY SUGGESTIONS?