How can I use the software if my system is not at all booting?

Well, this type of situation occurs due to boot sector viruses which mainly spread through floppy disk when you inadvertently leave a floppy disk in your computer disk drive for a long time. However, with the aid of Yodot Hard Drive Recovery software you can easily get back your data even if your system is not booting up. For that you have to remove hard drive from affected computer and then connect it to healthy computer as a secondary drive. Once the hard drive gets detected, download the software to the computer that is working and install it to start the recovery.