Pc wont boot

I posted this problem a day or two ago here and was told to use Linux and clear my c drive . I have no space in my c drive and it keeps taking me to the blue screen . Now I can't reset it in any way it says on the blue screen .Can't reinstall windows through a usb for some reason. I can't delete files through the Linux and CMd on the blue screen because I am not logged in and the files are encrypted .what do I do