ASUS X553MA pre-installed with windows 8.1 or Windows 10. Actually you can install Windows 7 for this notebook. Before installing Windows 7, you need to change BIOS setting by selecting Windows 7 on OS selection Menu.
Windows 7 Installation:
1. upon power on press F2 to enter BIOS. 2. using arrow key select ADVANCE. 3. On OS selection, select Windows 7. 4. Press F10 and press enter (Save and