Windows 2000 does come with EFS
The Encrypting File System (EFS) included with the Microsoft® Windows® 2000 operating system is based on public-key encryption and takes advantage of the CryptoAPI architecture in Windows 2000. Each file is encrypted using a randomly generated file encryption key, which is independent of a user’s public/private key pair; thereby stifling many forms of cryptoanalysis-based attack.
http://www.microsoft.com/windows2000...y/efssteps.asp