Acer Aspire 5100 - Manual (Page 18)

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To activate Acer eLock Management, a password must be set first. Once set, you
can apply locks to any of the devices types. Lock(s) will immediately
be set without any reboot necessary, and will remain locked after rebooting,
until unlocked.
Note: If you lose your password, there is no method to reset it
except by reformatting your notebook or taking your notebook
to an Acer Customer Service Center. Be sure to remember or write
down your password.