COM add-in desactivated in Word 2007

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Hi,
I have a small add-in that adds a group in the ribbon. It has been made with
VSTO 2005 SE. When I install it, it appears in the COM add-in list, but it's
desactivated. If I try to activate it manually by checking the check box in
the add-in list, it doesn't work (the add-in stays desactivated).

I'm working on Windows XP SP2 but I precise this add-in works on my others
computers, with XP or Vista.

Thank you.
 
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