Miley Cyrus

What is the best keylogger to record all computer activities?

Hi,
Who can recommend me free keylogger to record all computer acitities stealthily?
I just find download this : iSafe Keylogger, from http://www.isafesoft.com
But how to use it to monitor my son ?
Thanks in advance.
Thanks for your answers.
After my try and compare, I choose iSafe Keylogger from iSafesoft.
It’s really the best keylogger as descripted on iSafe Keylogger official website:

http://www.isafesoft.com/