I am having the computer system which has the Windows Vista operating system preloaded by the manufacturer. Now coming to the problem, Recently i made the Bootable installation disc of the Kubuntu operating system using the Nero from the Original Kubuntu installation disc from one of my friends. So that i can keep it with me. But the problem is that, when i am trying to install the Kubuntu OS from this Disc the system is not able to boot from this disc. The system goes to the Windows Vista startup screen. Computer not booting using Kubuntu installation disc. But with the original Kubuntu disc the system was able to start with the Kubuntu operating system.