Run Avast From Usb
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LiveCD/Rescue CD/USB utilities are tools provided by most anti-virus vendors to assist with difficult to remove malware without having to boot into Windows. They are primarily used to boot from and repair unbootable or damaged systems, rescue data, and scan the system for malware infections. With a bootable virus scanning utility, you create a flash drive or CD/DVD disc from a working computer and then use it on an infected machine to scan the hard drive for malware. These types of utilities permit offline scanning which can disinfect malware from outside the infected Windows system. The advantage of offline scans is that they can be used when the malware is not running and interfering with the clean-up process.

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Rescue CD’s typically come as an ISO image file that can be written to a CD or installed on a USB flash drive which is then used to boot-up the computer to run the live operating system in memory.