Outlook Shutdown Problem - Outlook.exe stays running

[Stevens]

Office XP standard on XP Pro machine, in a Workgroup with
a file server. Outlook works fine, however when closing
Outlook, all indications are that it has closed, but
opening Task Manager reveals that Outlook.exe is still
running. If you try to shut puter down, Outlook "End
Program" pops up. If you try to reopen Outlook, without
killing in task manager, a second Outlook.exe pops up in
Task Manager, but Outlook never opens. If you continue to
click on Outlook icon, you can open a seemingly infinite
number of Outlook.exe's. Have run "Detect and Repair" and
have tried reinstall with no progress. Suggestions
welcome.

Cheers

Stevens