CAN i password protect my folder on windows?

Do you want to protect it within same user account or protect it from other user account? If you wish to protect it within same user account, where you want to prevent people using your own account to view the private folder, then you need to install 3rd party software in order to make it work. If you just want to protect it from other user account, you can set it in the security setting.

you can protect your folder by folder lock software.searce on net their many folderlock software. you download and use this kind of software.