You might have ever repaired your Windows with a Windows bootable cd. This situation comes when your windows faces some serious problem which needs immediate booting. But do u know you can even use your USB pen-drive rather than using any bootable cd. For this to work firstly pen-drive is to be converted to a bootable media. Makebootable is a free and easy to use software for this task.Here comes the process………backup all the files on the pendrive.Then,format your pen-drive with fat file system. Now, run Makebootable.exe to finally turn your pen drive into a bootable media. Go to your BIOS setting and go to boot area.Plug in your pendrive so that it is listed in the boot devices.You can now choose your pen drive as First boot device.Using F10, save and exit of BIOS. Your computer will be restarted and you will be in a position to boot through your pen drive.