Are you looking for a way to finally make your computer safe from the hands of your little kids that loves to play around with your keyboard that often makes your desktop scrambled or worst some of your files being deleted, well here is a free app called KidSafe that can do the job. KidSafe was designed to be a computer-locking program that will keep young children from messing anything up.
When you run KidSafe it will launch a full-screen window that hides the entire desktop. The windows will be blank so your kid that enjoys clicking everywhere will do any damage to your computer.
There are options on KidSafe that you can configure. You can change any settings that you feel necessary for your system.