I have read previous answers & I still have not fixed anything. I have a Lenovo with windows 8, I turned my computer off & now it is stuck. I have left it cycling fot over 24 hours and it never comes to an end. I have a windows 7 disc, i thought that I could just load it on because I don't need windows 8 anyway. The computer starts to boot, but freezes up on the windows screen. I do not have a usb device to fix the boot, is there somewhere I can get one of these?