I know that my usb stick is bootable and i have made it according to the steps in http://www.ubuntu.com/download/desktop/create-a-usb-stick-on-windows.
And it is booting but it shows an error message that, cannot find an operating system.
I have used the same setup, and installed it by double clicking the wubi.exe from my windows, it downloaded ubuntu-12.04.3-wubi-amd64.tar.xz and installed.
So i am not getting a wrong OS AND i am having bootable usb stick.
BUT still have the same cannot find an operating system. ERROR. Plz Help me..I am new to linux and ubuntu.