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.
Also note, that if you do a restore to factory default setup, you'll lost your files on the system partition. So if you have important files there, you should try to get to those first.
In that case you should try starting the system in Safe Mode (Press F8 during startup). If it works, you can save your files to another partition or rather to an external device, and then do the restore to factory default.