Acer Aspire S5-391 User Manual page 46

2. If it is not already enabled, you must enable the F12 Boot Menu:
1. Press <F2> when starting your computer.
2. Use the left or right arrow keys to select the Main menu.
3. Press the down key until F12 Boot Menu is selected, press <F5> to
change this setting to Enabled.
4. Use the left or right arrow keys to select the Exit menu.
5. Select Save Changes and Exit and press Enter. Select OK to
confirm.
6. Your computer will restart.
3. During startup, press <F12> to open the boot menu. The boot menu
allows you to select which device to start from, such as the hard drive
or an optical disc.
4. Use your arrow keys to select the line CDROM/DVD or USB HDD, then
press Enter. Windows installs from the recovery backup instead of the
normal startup process.
5. Follow the onscreen prompts to complete the recovery.
46 - Recovery