Windows has no switch that puts a password on a folder. The usual advice is EFS, which ties a folder to your Windows account instead of a password, or BitLocker, which encrypts a whole drive, and that gap is why the same question keeps coming back on the Microsoft forums year after year. SoftOrbits Folder Password Protector does what people actually ask for. You pick a folder, you set a password, and the folder stops opening for anyone who does not know it.