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Kaspersky Rescue Disk is a free tool that enable users to boot from a disc or USB device and scan their computer to find malware or edit Windows registry settings.
If you cannot start Windows normally or you cannot run the antivirus software normally, a tool like this may help you to be able to get rid of viruses without loosing entire C: drive.
Practically, once you start and boot from this disc, you can scan and fix malware on your PC. Allows to set different configuration options, also includes a Windows registry editor if you want to inspect or make modifications in Windows Registry files.
Do not forget to update it before making the scan.