To mount your Vista file system (assuming you have one) add this line to /etc/fstab as root:
/dev/sda1 /media/VistaOS ntfs-3g nls=utf8,umask=0222 0 0
then go to in Thunar to /media and bookmark VistaOS (in my case) to get to it in the future. You can name “VistaOS whatever you like. Reboot after changing the fstab file.