I think my laptop was infected by some kind of viruses (same issue with wan ahmad). 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.
Start a new topic in V&W and post your logs there: https://forum.avast.com/index.php?action=post;board=4