If doesnt help use this one (reset factory defaults)
How to recovery your system from bootup
Locate the Alt key, to the left of the space bar, and F10, on the top row of keys.
Power the system on.
When the system is powered on, tap the Alt and F10 keys together at the same time when the Acer splash screen appears. It should state "Please wait a moment..." with the Acer logo in the upper left hand corner.
At the eRecovery Management menu it will ask you how to restore.
Click on the restore option you would like to use.
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