Alternatively..
i use any linux-live cd (prefer Debian-Rescue-Live distribution)
Boot the linux system with the hard drive to install ZS already installed.
then, i ‘wget http://na.mirror.garr.it/mirrors/zeroshell/ZeroShell-2.0.RC1-IDE-USB-SATA-Disk-2GB.img.gz’ (the current USB/HDD/image file)
After this it’s cake!
gunzip -c ZeroShell-2.0.RC1-IDE-USB-SATA-Disk-2GB.img.gz > /dev/sda (where /dev/sda is the device object name of the hard disk to be installed to)
This assumes the Live-CD detects your hard disk, network hardware, and internet connection.