RJM Security Utility
Rjm Security Utility is a small Windows XP program providing high quality file encryption and secure file deletion. It is ideally suited for use with USB Pen Drives. Rjm Security Utility requires no installation, does not write to the registry and writes no permanent files to your system other than those being encrypted or decrypted. Rjm Security Utility works fine for Restricted users providing you have appropriate access to the files you are using (such as those on a pen drive) or those in your "My Documents" folder. This software is provided "as is", without any guarantee made as to its suitability or fitness for any particular use. Use of this tool is at your own risk. We take no responsibility for any damage that may unintentionally be caused through its use.
RJM Security is free and is available from here.