file encryption after installation

Is it possible to flick a switch in menus or command line to reverse my decision during install not to encrypt my files? Sure would appreciate knowing how if it can be done.
Thanx %:))SW

what i would recommend is

what i would recommend is first installing ecryptfs-utils "sudo apt-get install ecryptfs-utils" then I would create a new user with encrypt enabled "sudo adduser --encrypt-home foo" foo being the new user name. then log into the new user and copy the home dir from old user to new user and then it will be encrypted. if that does not sound good to you, you can do it on the current user but it is a little more complicated. here is a link to the page that will help.