In my case, using Windows XP with Office 2007, the erroneous file was:

ExcelToGM6x.xla ( Microsoft Excel Add-In ) in the folder C:\Program Files\Microsoft Office\Office12\XLSTART

I suspect that not everyone will have GoldMine, but that folder is a good place to start looking.

Initially I tried the Adobe Acrobat resolution but that didn't work for me.