This is nothing like enough information. The likely causes are
something along the lines of the addin isn't installed where the
version of XL you are using expects to look for it or was built with
a different version and has incompatibilities that prevent loading.

Try manually checking the location of files and the paths being
searched for addins and if necessary manually install to test it

Given that the problem doesn't occur on any other machines, I suspect
things went awry during the 're-imaging' process and Excel (or Office)
is in need of 'repair' via ControlPanel!

--
Garry

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