Kaspersky Rescue Disk is a free tool for scanning and disinfecting the operating systems that cannot be accessed directly due to infection.
It includes Kaspersky Rescue Tool, the tool which implements scanning and disinfection of operating systems.
Write Kaspersky Rescue Disk to a USB drive or CD/DVD disc and boot the computer under it. Use Kaspersky Rescue Disk when it is not possible to scan the computer or disinfect the files using the antivirus solution installed on your computer. For example, you can use the tool if malware blocks loading of the operating system or starting an antivirus on your computer. Advanced users can manually recover corrupted operating systems with Kaspersky Rescue Disk.
Kaspersky Rescue Disk cannot be used for long-term protection of your computer. After disinfecting the system, install a regular antivirus solution.
Knowledge Base Product Kaspersky Rescue Disk is here: https://support.kaspersky.com/viruses/krd18#kb