Various ways to password protect a file or folder using Microsoft Vista are shown in this video. The first step is to choose a file you want to add a password to. After you decide on the file you wish to protect you must right click and select add to archive using Win Rar. After the file has been opened using Win Rar you can then select the add password option to begin encrypting the folder. After you type in the password of your choice you must select ok to finish attaching the password. Once the password is attached the file protected until the archive is reopened and deleted.