"My parents do not understand what is the Internet ."
Nine out of ten children aged between eight and 16 have viewed pornography on the Internet. In most cases, the sex sites were accessed unintentionally when a child, often in the process of doing homework, used a seemingly innocent sounding word to search for information or pictures. (London School of Economics January 2002)
"My son has deleted my WORD document..."
An unauthorised download, a simple key pressed and here is you PC infected by viruses, spy wares and unwanted toolbars. Or worse: all your work deleted with no possible recovering!
Leaving your children using freely your PCis a risk for him and also... for your PC ! Leaving your children using freely your PC is a risk for him and also... for your PC!
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"How can I avoid all this ? "
Try to install a control system: no one will be able to access your PC without respecting your own rules: Parental Key Locks your computer prohibits unauthorized use of the Internet, prevents chosen program from being executed: no complex manipulations, no complicated configurations: you choose your own rules !