I want to install an unsign driver on windows 8 pro, and I cannot find a way to do it. I've found some solutions but none works. First tried the advanced startup options from Settings-> General -> Advanced startup but there is no option advanced startup on Trubelsooting. Just there isn't one there. I tried the command: bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS which suggested and in a thread here, but it doesn' t work too. I get the error: The boot configuration data store could not be opened. I also tried with msconfig.exe, but I cannot find an option there, and I cannot check any of checkboxes on Second tab(Boot computer or something similar is the title) or buttons as "Advanced", "set as default", "delete". This tab is completely unreachable. I tried some repair and diagnostic options of windows 8, but doesn't change anything. Can someone help me?