Howdy, I'm out of idea's. Have 2 of these old core 2 duo machines and I can't seem to get the Hdd in a state that win 10 is happy to start an install. Error below. Click to view full size! I've tried a few Hdd's. Formatted under cmd prompt, cleaned, and tried as may bios settings with no change. I'm installing from EDIT (A usb 2 TB HDD Seagate booted from boot menu with Win 10 32 and 64 prepared via Microsoft media creation tool) a ms prepared bootable medium hdd. Tried both 64 and 32 bit win 10 home. I think is a bios setting that's protecting the hdd but I can't seem to find one that will change the fault. Model # is HP DC7800 - PT#AUD83705x5. Can't find any mb identifier info. Core 2 duo E6750 Any idea where I should be looking?