If you keep your system pretty well locked down, with a strong Windows log-on password and a firewall, but occasionally work with sensitive information and want to add an extra layer of security, you can encrypt individual files or folders. Right-click on the file you want to encrypt and choose 'Properties'. Click on the 'Advanced' button in the 'Attributes' area of the 'General' tab. Check the box titled 'Encrypt Contents To Secure Data' then click OK twice. You won't notice a difference, but any other logged-on user will be unable to view the file. Note though that unless you go through a complex process to export your account's digital certificate and private key information, you too will be unable to access the files if you lose access to your account.