Microsoft has released a free application that allows users to create an encrypted and password-protected folder. Microsoft Private Folder 1.0 works on Windows XP and Media Center Editions with Service Pack 2 and is meant to provide a consumer-level of protection. Microsoft warns that it is "not intended to provide security against hackers."
Interested users can download Private Folder from Microsoft's website which requires Internet Explorer and "Genuine Windows Validation". A reboot is required after the install. After the reboot, Private Folder requires users to make up a password, but unfortunately only alpha numeric characters are allowed in the password.
At first glance, Private Folder doesn't seem to be so private because it places the icon on the desktop. However, that icon is just a shortcut to the real folder which is located at C:\Documents and Settings\YOURUSERNAME\My Private Folder. It's safe to delete the desktop icon and create a shortcut anywhere else on the drive.