I am not able to download avast . At the end of download it is giving error as source could not be read ,cannot save the fileTry latest avast with updates, and get usb security
if you format it and the virus show again,you should check your host PC,and there may be virus in it.Might be time to reformat and reinstall.
Based on your past posts and previous virus problems I suggest you get a proper anti-virus program and watch were you put your pendrive.
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