Hi 芳実 鈴木,
Good day. This error message usually means that your computer is trying to boot from the network instead of your Windows drive. Try to change the Boot order of your PC.
- Shutdown first your PC
- Turn it on and immediately press the BIOS key repeatedly. Keys are usually F2, Del, Esc or F10 depending on your mother board model.
- In BIOS/UEFI, look for Boot, Boot Order or Boot Priority or any that is related to Start-up sequence.
- Make sure that Windows Boot Manager or your SSD/HDD is listed first.
- Move anything called, PXE, Network Boot, IPv4, LAN Boot and move it to the bottom or disable it.
- Save and Exit. Usually F10.
Hope this helps.
Regards,
Jhun