Help please...trying to clean C disc and after that message shown on screen..BOOTMGR IS COMPRESSED,press CTRL,ALT,DEL to restart,after that nothing happened shown the same message, I don't have installation CD and cannot get one and my laptop(BIOS) doesn't have option to boot from USB..is it possible to fix this error without CD or USB????? Thanks for any hepl.. Windows 7 is OS...