Com Add-In stopped to work

I have a Com Add-In that work on users station for a long time(more than a year), and now on few station it's stopped to work.
I tried to erase the Add_In and install it again, to eraes Outlook and install it again,to eraes Office and installed it again, but the Add_In doesn't work.
This problem is in all systems - win 98,2000,xp .
We work with Outlook 2000.
How can we fix it ?
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Do you know if the outlook was updated in those machines ?

Can you check if there is any update or higher version for the same add-in.

What does the add-in do ?

Once removing the add-in , close OL ,  go to this registry location



and remove the add-in entry (if found).

Open OL , install the add-in again and check


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