Office and Windows Jounal always do this... Office does this so that it changes the paths for each user and only does this once for each account, but it wont ask you for an installation path!!!
I also had the same problem with Windows Jounal and I didn't know why, so I have uninstalled it and hidden it on the "Windows Update" page so that it wont be installed again (I never used it in anyway!!)
Hope my experience has helped you!!!