Microsoft Private Folder 1.0 is a useful tool for you to protect your private data when your friends, colleagues, kids or other people share your PC or account. With this tool, you will get one password protected folder called ‘My Private Folder’ in your account to save your personal files.You can get it over here.
Microsoft releases Private Folder 1.0

MS Blog writes Microsoft released a tool called Private Folder 1.0, it lets you have a folder called "My Private Folder" which you can password protect.