Go to your favorite search engine (yahoo, google, cuil, etc) and write in "free keylogger " and you will get many that are free. Read about the different free ones then decide which would be the best one for you, then download it to your computer. The keylogger will not be able to be detected by anyone only the installer. You use different letters etc, like a password to get into it. When you go back into it after a day away from your computer it will show you who used your computer and every keystroke that was typed. You may legally use a keylogger on your computer or your teenage childrens computers, to make sure they are not going to websites they should not be on. I hope this helps. Good Luck..