So, today, I installed Antergos in dual boot with Windows 10. When I finished the install of Antergos, I rebooted my computer, and this showed up. Warning: Spoilers inside! I tried to reinstall GRUB with an Ubuntu 15.10 Live CD, with the MediCat DVD, and each time I reboot my computer, it shows up. Also, my Windows Boot Manager is still intact, if it can help somebody to find how to solve my problem.