Answer by  
                                                                                          sreeju555 (6)
                                                            
                          
                          
                                                          First time you can switch on your computer and inserted the disk you want to boot. The next step is press the BIOS Key and  enter to the BIOS setup. You can select  boot device priority option. Please select first Boot Device as CD ROM. press F8 key and exit with saving. press any key to boot from cd.