U can't use a password to lock a folder.However, some programs that run on Windows allow you to protect individual files with a password. You can encrypt your files using Encrypting File System (EFS), manually specify who can access the folders or files by setting permissions, or hide them. Choose your method based on how secure the folders or files need to be. Encrypting is the most secure, while hiding the folders is the least secure. Hope I helped u.. Plz mark as the BRAINLIEST answer..