Encountered this problem when trying to install windows: I couldnt install windows in C ,neither to format that partition because of this message [Windows cannot be installed to this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks] and an error code 0x0000 smth... while attempting to format the C. I could only manage to instal windows after deleting all of the partitons???? On another install more recently ,even I was having a single c partition, I still couldnt manage to instal my windows there or format it without deleting that system reserve partition, backup one and EFI one. Is anythink ok in doing that and should I change the partiton table style an reinstalling winodws that way?how? Also dont know if this has relevance : during the windows installation from disk when I was prompted to choose from where to boot in boot menu there was besides the SATA corp an UEFI one also but I selected to boot from the SATA one? I dont know if it was correct but I managed to install Windows ( ofc after deleting the stuff I mentioned) but now when I entered the boot menu I can only see the SATA one.