Some antivirus companies provide "rescue system" software that you can download for free and used to create bootable DVDs or flash drives to boot a PC outside of windows and scan the system for viruses and other malware. The software can be used if a system won't boot because of the malware. Avira, a German antivirus company, provides Avira Rescue System antivirus software that can be used to scan a system running a Microsoft Windows operating system. The ISO file that you download to create a bootable DVD or flash drive contains the Ubuntu Linux operating system, but you don't need to be familiar with a Linux operating system to use the software.
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