From Cypherix Software
Cryptainer LE is a totally free 448-bit disk encryption software. Simple, easy to use encryption application that creates encrypted 'vaults'. One can store any kind of data in them. Cryptainer LE Free Encryption Software allows you to encrypt any file or folder on any Windows PC. Protects all types of Media and any type of data. Password protect any file or folder with strong Encryption. It allows you to protect data on USB Drives, Mobile Devices, Flash Disks, Pen Drives, CDs and HDDs. Cryptainer LE ensures complete security for your data making sure that only you and nobody else can access your data. Cryptainer LE creates an encrypted volume that can be accessed only with a password. Once mounted, the volume behaves as a standard windows drive. The files can be read, viewed, modified, as well as moved from one place to another. Hides any type of data on any media. Any kind of file - from word and excel documents to movies and pictures, can be encrypted. You can also send secure email attachments. It runs on all versions of Windows (Windows XP, Windows Vista, Windows 7, Windows 8.x as well as Windows 10 family). Simple, Secure, Absolutely free. No Nags, No reminders, Not Adware. The best part - this package is totally free to use. A must have for every desktop.
x486 or better, 30 MB RAM