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Hi David, thanks for responding! 
Can I ask if you are one of the offical developers/programmers of Avast? If no, then could you please guide/refer me to them? Sorry to trouble you.
I mean, how could my files from the desktop folders go missing? And where did they went to… I tried searching the names of the files but to no avail. 
Again, sorry to trouble and thank you very much! 