Outlook express fails to open

I run outlook express with XP home.When I attempt to open all I get is a quick flash in the centre of screen of the blue first page and then it goes no further.Ive tried rebooting but its still the same.
Ive done nothing to the pc at all since I last used it.Its remained on but I run firewall and have AVG installed as well.
Any clues for me?Thanks

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