Acer AOP531h - Manual (Page 22)

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Launching Acer eRecovery Management
1 You may also launch Acer eRecovery Management by running the program
from the Acer program group in the Start menu, or by double-clicking the
icon if you have created a desktop shortcut.
2 You can choose to restore the system from a factory default image or
reinstall applications and drivers.
3 Follow the instructions on screen to complete the process.
Note: External optical disc drive required. Please see your retailer
for more details.