Last night I was fed up installing windows on my laptop after doing the formatting. I had a setup of Ubuntu, so just changed the boot preference in boot setup and tried to install ubuntu and try my luck. But it didn’t worked. After googling I discovered that,you can install Ubuntu from a portable hard-drive or a thumb drive also. All you need is a simple application named Unetbootin which is available for Windows.
Go to the Unetbootin SourceForge hostingpage to download it. The download is sized at under 500 KB and has options to create a bootable drive for installing Ubuntu from a downloaded ISO. Just feed the ISO path, version and your USB drive location to create the bootable disk automatically. The ISO image of ubuntu OS is available on their web site. http://www.ubuntu.com/download/desktop