I was just hoping to find a way to automate this a bit. For example User A may have Dropbox installed at c:\users\UserA\My Dropbox. User B may have it installed at c:\temp\Dropbox.
If a toggle could be added to look up these values in the registry, I wouldn't need to a) know if they are using any of these apps and b) not need to figure out where they are installed. This would also be problematic if I do the install as a different user (e.g. the user doesn't have admin rights, so I logon as the local admin to do the install).