Building Excel add-ins installer in Visual studio 2010 ( use of MSXML2 for Excel object)

Question

I wrote an add-ins in Visual studio 2010 and I build an installer to deploy it on Excel 2010. Things used to work fine until I add a reference for Excel object (Interop.MSXML2).

Since then, I am no longer able to deploy it. Excel always crash. any ideas ? do I need to add the dll into Excel first ?

Thank you in advance!

Brice