Kevin is having issues with his files and folders disappearing in Windows 10. Leo says that obviously that's not supposed to happen. It's easy to accidentally drag a file or folder somewhere without knowing it. He should use the search feature to try and find it again. He should also look in the trash can. If he can't find it there, then it could be a failing hard drive or malware. Some malware will do this. He can run a scan on his computer by pressing Windows Key + CMD and type "MRT" for the malicious software removal tool. Then he should run a full scan. That will look for malware.