They are useful if your system has become fully infected by  malware or viruses  so that you cannot install an antivirus or anti-spyware tool anymore.

In such a case, the best recourse is to boot from a rescue CD so that your antivirus software is running on a clean system. From that clean system, it will be able to detect and remove viruses without interference from the infection.

With all of these bootable cd are provide as an ISO file, that you can burn it through nero to the cd or dvd.

Kaspersky Rescue Disk

Kaspersky Recue Disk 2009

This rescue disk contains a bootable CD that will boot to a Linux environment, and run a version of the Kaspersky anti-virus program.

Dr Web LiveCD

Linux base DrWeb antivirus

It boots to 2 possible modes: a graphical mode or a command line “ safe” mode.

Antivir Rescue CD

Avira Recue Disk

F-Secure Rescue CD

It works on FAT and NTFS drives. If you boot the rescue disk on a computer that has an internet connection, the antivirus software will automatically get the latest virus definitions.

BitDefender Rescue CD

Bit Defender

It is the linux base bootable cd, but it can heal lot of viruses running on Windows.

Panda RescueCD

This rescue CD scans and deletes viruses on your system. Note that it is not able to delete viruses on Windows NTFS and Linux file systems.

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