I am using windows, I have downloaded ISO of Vector Linux 7.0 (VL7.0-STD-GOLD.iso). I don't have a CD Rom, How can I create a bootable USB of this Linux to install it on my system.
Unetbootin don't support vector linux.
try the linux USB installer from PenDriveLinux. its pritty easy to use and works with any downloaded Linux Live ISO.
You can find it here: http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/
The working solution is : LinuxLive USB Creator 2.8
Note: Universal-USB-Installer does NOT support VectorLinux