Xfce - Can't mount Windows partition

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https://bbs.archlinux.org – The icon appears on the desktop "320 GB Filesystem" but when I double-click it it tells me"Failed to mount '320 GB Filesystem'Authentication is required"However I am able to open flash drives and external hard drives.Here is the launch line in .xinitrcexec ck-launch-session xfce4-sessionIt used to open in Gnome 3 which I just uninstalled. I'm trying to figure out if there's some sort of required package that went away when I removed Gnome 3? Perhaps something like gksu but it is still installed.dbus is in my startup daemons, gvfs is installed, ntfs-3g is (HowTos)