Hi Lewis,
One of the following links may help you. If the VBA solutions don't work, you may have to remove the item from the Registry. I have not tried any of the fixes that follow, since I don't use Add-Ins:
http://vbadud.blogspot.com/2012/05/e...el-addins.html
https://support.microsoft.com/da-dk/kb/211956
https://www.google.com/search?q=exce...utf-8&oe=utf-8
Lewis
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