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He meant that as a Heading to the next step…you must do the next step as he said and use MCShield to clean the USB up as he instructed.The reason he asked you to use MCShield because the infection you have is USB based and it is polymorphic infection which changes everyday and this makes it very hard for any antivirus program to detect.If this would have been a normal autorun infection then avast is excellent at detecting those but polymorphic crap like Zaccess and JS:Autorun infection that you have are a pain in the neck.But luckily out of those 180 or 185 million avast users only a few contract these,and then avast community gets those samples from the infected machines automatically and the rest become protected.