Microsoft provides the Microsoft Security Essential that can be downloaded free of charge for users of Windows Genuine.
Microsoft Security Essentials is an anti-malware products without the cost of providing protection for consumers against various threats, including viruses, spyware, rootkits, and Trojans.

Download Microsoft Security Essential - Free

The Internet gives us the world at our fingertips. Unfortunately, sometimes those fingers belong to a child. While innocently surfing 'the net', children can be exposed to inappropriate material. They may accidentally reveal personal information, their own or their parents' credit card data, for example.

The first line of defense is to teach your child how to use the Internet safely. Children are interested in computers and the Internet as early as age two, and young children can be easily guided to appropriate web sites that provide entertainment and education.

As children get older, however, it becomes more difficult to supervise all their online activities.