Dumb question, but is the Encrypting File System the little checkbox in the Properties of a file that says "Encrypt Contents To Secure Data"? Just wondering.
Be sure to backup your recovery certificate someplace! Like Siliconjunkie mentioned, if you can't boot up into this installation of windows you will not be able to unencrypt the files without paying $. Just reinstalling the OS again will not allow you access to the encrypted files. Nor will putting that hard disk into another machine. Backup your recovery certificate!