My computer came with stock windows 8, here is my problem: I have to boot in legacy mode for newer OSs (win8.1, 10 etc) I cannot boot any of them in UEFI, I get the message that bootmgr is missing even though I clean installed with my windows 10 installation which forces me to turn on legacy mode in my bios to boot into my OS. I did wipe the original windows8 in the past with win7. Now I need to upgrade to 10. Is there any way to boot into uefi with secure boot since I deleted the original windows 8 with a new fresh install of windows 10? Would I need to format the HDD in order to correct the error of bootmgr missing?