If you have a small child, then you will benefit from a small program Toddler Keys, which can be downloaded for free.
Toddler Keys can lock the keyboard, mouse, and drives, and starting with Windows XP, it is possible to lock the computer and power buttons.
To start Toddler Keys you just need to double-click on the icon of the program, then you can safely put your child in front of your computer, because even pressing any keys, it will not be able to harm the system, delete any important file. It is possible to upload to the program folder any images and sounds that will be activated by pressing any key. Your child will be interested in looking at the pictures or pictures that appear with their favorite cartoon characters, and the sound signal will play the role of a detector, he will report that the child is busy with the computer, not looking for adventure.
To exit the lock mode, simply enter the password you have set and all the operating functions of the computer will be restored. Toddler Keys will give you the opportunity to do your business, leaving your child at the computer without fear.