Hide Files 2.3 (free)
You have any files or programs that you don't want to share with other or
they contain financial and tax information, passwords, personal letters and
emails, private images, and other confidential or personal data. But
typically, computer files and folders have not security protection so the
best way to protect them is to make files or folders invisible for another's
eyes. Hide Files makes hidden any files and folders (or whole Windows folder
or even all computer disks).
http://www.computerboom.net/download/utilities.html
The question about the 9/11 victims is this: Who really did it?