After deleting trojan virus from my usb flash drive all my folders were gone, though the only one gone are the folders that have files on it and files that are not in a folder are still in there. Also, the mb size of my USB flash didn't change, so, I think it is just hidden on my USB flash drive. But I already tried to view hidden files but the folders still did not come out.
I just copy files from my usb and save it to the infected laptop, and I didn't save anything from the laptop.