First, you go to the control panel-folder option, select "Show all files and folders" and "Show contents of system folders", and then confirm.

Then, when you go to the USB flash drive, you can see your lost folder.

Then, the virus is very powerful, and the properties of your hidden folder have become hidden, but you can't get rid of this hook. What you can do is to create a new folder and then move out the things in those translucent folders.

What's more, those folders that you can see by yourself are actually viruses, each of which is about 1m, and they are exe files. You deleted it.

Finally, don't forget to tick off those two options again, otherwise it will look uncomfortable.

This is my problem. I don't know if you are exactly like me. Just try it.