I baught a new laptop toshiba l50-b x0011 (i5 processor) with dos,,,i want install windows 7 or 8 but when im restarting its shown a "No BOOTABLE DEVICE-RESTART SYSTEM" AND I RESTART PRESSED F2 OR F12 BUTTON. OPENED MENU BUT HOW TO DO THE SETTINGS AND INSTALL FINALLY SAME MESSAGE CAME NO BOOTABLE DEVICE