I guess u should burn it on CD/DVD , then just copy all the files in the CD/DVD and paste them in your formatted USB-flashdisk (format the USB-Flashdisk before pasting the files to avoid any kind of technical Problems during the Installation) . Please make sure to copy all the files from the CD/DVD including the hidden ones (if available). then shutdown your computer , power it on and enter the Boot settings (press F2 or F5 or F12 i am not sure it depends on the Motherboard you have) while having your USB-flashdisk plugged in. After that set your Flashdisk as the Primary-Boot device and thats it ! the installation should start. If u dont wanna lose a DVD/CD (lol) and have DAEMON TOOLS or POWERISO Software then , you should be able to directly extract the iso Image to your Flashdisk without the need to burn it onto a CD/DVD. ! . GOOD LUCK