If you need to boot a system outside of the operating system residing on its hard disk drive, a live CD or DVD provides a means to boot the system from an optical drive with an operating system that is on the CD or DVD. There are many Linux-based live CDs, which can be used to boot and troubleshoot systems running Microsoft Windows as well as those running Linux. Many Linux-based live CDs have antivirus, backup utilities, etc. that facilitate troubleshooting and maintenance of Windows systems. One such live CD is SystemRescueCd.
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