Acer TravelMate P245-MG - Manual (Page 49)

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English Note: After configuring Windows 8, enter the BIOS (press when
starting your computer) enter the Boot menu and change the Boot
Mode to UEFI.
Please refer to "Changing BIOS settings" on page 32.
Changing to Windows 7
To change back to Windows 7, you must change Boot Mode back to
Legacy BIOS. Windows 7 will not start if the BIOS Mode is set to
UEFI. Please refer to "Changing BIOS settings" on page 32.
Start Windows 8; from Start, type ‘recovery’ to open Acer Recovery
Management.
1. Select Restore Factory Settings.
2. Select Yes.
3. Select Windows 7, and then click OK and follow the instructions.
Windows will restart, replace Windows 8 with Windows 7 and then start
the Windows 7 setup process.