I have to users, on 2 separate machines who are having this same issue. They load the Analysis Toolpak add-in, but the next day when they turn on their PC, the add-in is not loaded. What would cause this? I can't duplicate it on my machine. They work in an office about an hour away, and no one else in their office has this issue. Before I drive down there, I was hoping you'd have some ideas for me to check out.