Hi,
I think my laptop was infected by some kind of viruses (same issue with Famzi Musa). When I inserted a flash drive, all of my files are gone, there will be 2 files appeared which is REMOVABLE DISK 7GB(Secured By Kaspersky Internet Security 2017).bat and readme.txt. when i click on the file REMOVABLE DISK 7GB(Secured By Kaspersky Internet Security 2017).bat ,a folder will appeared, named System Volume Information and it contained all of my files. Then, i put another drive and the same thing happens. I had formatted my drive but the files still appeared. I had also tried to scan my laptop, but it does not detect anything. What should i do? I really need your help. Thank you.
Follow instructions and attach requested logs here in your next reply >> https://forum.avast.com/index.php?topic=194892.0
The two diagnostic logs from step #2 FRST are the important ones