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Bitdefender Rescue CD is a free tool that scans and cleans your computer without running installed operating system. Bitdefender Rescue CD can be set up either on a CD/DVD or on a USB flash drive.
Free eScan Rescue Disk allows to remove malware from computer without running installed operating system.
Free Kaspersky Rescue Disk is a useful tool to scan, disinfect and recover infected operating systems. Very useful when it is not possible to boot system from HDD.