Reply: 1. Enter the BIOS first
2. Then select Load Default Setting (press Enter), and select Yes to load the default value.
3. Select the Boot option above and change both Boot Mode and Boot Priority to the mode beginning with Legacy.
4. Finally press F10 and select Yes to save and exit.
5. After selecting the CD-ROM drive for a few seconds, “Press any key to boot from cd...” will appear on the screen. You need to press any key (such as the space bar) on the keyboard to continue the CD-ROM drive.
6. After loading, enter the installation interface, select Custom (Advanced), and click Next; first select “Driver Options Advanced”, and then the option to create and delete will appear. Pre-installed Win8, Win10 uses gpt mode which Win7 does not support , so you need to select the partition one by one to delete; delete all the partitions, and click New to convert to mbr mode (after deleting all partitions, the new partition can automatically convert gpt mode to mbr)
7. After deleting all partitions, click New to create a new partition.
8. Finally, you can install Win7 system normally.