does not work . error: unable to find project or library

thank a lot for your quick help. I write here what i did and found.

I did the following:

• Removed toolbar
• Removed excelequation.xla
• Stopped excel
• Restarted excel
• Put excelequation.xla in c:/...../my_folder/application_data/microsoft/addins/
• Downloaded examples.xls from codecogs and started xl.
• Clicked on the second formula and clicked on render eqn.

the error states cannot find macro ExcelEquations_Examples.xls!latexIT I tried to uninstall, delete files, start with a blank file but

• either it does not find the macro
• or it ask for a password.
• some times it ask for a missing library (dll)

is there a way to link the button to the macro manually or some key in the registry to clean in order to make it start working again? a new addin in few weeks would anyway be a good solution. thanks a lot again