I would recommend trying Encrypt Files if I were you.
Can encode individual files or even entire directories.
Offers a great variety of encryption strengths including the unbreakable Blowfish with 448 bit.
Encryption speed is fast and source files can be securely shred.
When encrypting, it keeps the file name and size but turns it into unusable data.
Operates with the use of passwords.
Disadvantage: Doesn't provide a context menu function.
Completely Freeware
Website:
www.encryptfiles.net