People feel in-secured while leaving computers to children, and strangers because of valuable data stored on Hard disks.
Anybody can accidently delete our important data. So to prevent this bitter situation as a normal pc user we can safeguard our files, folders without any third party softwares.
Simply we have to use Security permission options available in every version of Windows operating system.
In this video tutorial I explained how to impose restrictions to various user groups in Windows.