ESET NOD32 LiveCD (now generally referred to as ESET LiveRescue) is a bootable rescue CD/USB image containing a lightweight version of the ESET NOD32 antivirus engine. It[SQ]s designed to scan and remove malware from a Windows computer that[SQ]s already infected and unable to boot normally or run standard antivirus software.

Here[SQ]s what makes it useful :

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Bootable from CD/USB:

It runs independently of the main operating system, bypassing infected files and processes that might block a regular antivirus scan.
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Lightweight:

It[SQ]s designed to run from a CD or USB drive, requiring minimal system resources, making it suitable for even older or slower computers.
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Antivirus Functionality:

It includes the core antivirus engine from ESET NOD32, allowing you to scan for and remove malware, even rootkits which are very difficult to remove from a running system.
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Independent of the Main OS:

This independence is its key advantage; if your system is heavily compromised, a regular antivirus scan won[SQ]t work effectively. The LiveCD provides a clean environment for scanning.

In short:

ESET LiveRescue (formerly known as ESET NOD32 LiveCD) is a powerful tool for rescuing a compromised Windows computer by providing a clean environment to scan for and remove malware.