Acer TravelMate P245-MG - Manual (Page 50)

Changing to Windows 8 or Windows 7 32
English
Changing BIOS settings
To change your BIOS settings, press <F2> when you see the Acer logo
during boot up.
Use the arrow keys to select Boot > Boot Mode.
Press <Enter>, then use the arrow keys to select UEFI or Legacy BIOS.
Press <Enter> again.
Finally, press <F10> to save the settings and reboot.