MS Solver Error. Not working.

Hi guys,

I just upgraded my Office from 32bit to 64bit and since then my solver addin won't work.

It appears at the right hand side of my screen, I can set target values, variables etc. but when it comes to running the addin a error message at the bottom pops up saying: "You do not have the permission for this action." 

I'm already running Excel as admin, reinstalled the addin, completetly deleted the solver folder etc. I have no clue. Anyone knows what to do?

Thanks in advance!