Reset to factory settings will wipe all data so make sure any you need to keep is saved to external device.
Re store is usually is usually indicated by on screen display at boot up in the Acer welcome screen at bottom left or right indicating to press f10 or11.
This can vary model to model
If not clear 'Google' Acer model /reset
The system's is built in on 'D' drive, no extra discs required