For this operation, you need an installation CD with the Windows operating system you want to set up. Once you have this CD, place it in your CD/DVD-Rom and restart the computer. When the boot starts, press the corresponding key to enter Boot menu. This is usually F2, F8, F10 or F12 or a CTRL combination. Eiher way, it will be displayed on the screen. Once the boot menu appears, select the CD/DVD unit and let the procedure start. Depending on the OS version you want to install, you need to follow the on-screen instructions as these offer excellent guides how to proceed with the installation.