Avast quick scan not starting

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This is one that is commonly asked on the Avast Forum, so it’s useful to post the answer here too. png files safe? If not, what should I do? I don't really like to have files on my computer that Avast cannot scan.

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png, so I did a search of all programs by typing *.png and the items that came up were photos our grandson had posted to Facebook from his recent trip to Thailand. Question of the week: Last week I ran a complete Avast Antivirus scan on my desktop computer and when it finished, it gave me the message that some files could not be scanned because they were password protected. Some files cannot be scanned by Avast Antivirus.