Microsoft security advice centre
Advice on all aspects of computer safety, including protecting yourself, your computer and your family.
http://www.microsoft.com/protect/default.mspx
Being safe when online (including safe chat, social networking, blogging, playing games, avoiding cyberbullying etc)
http://www.microsoft.com/protect/family/activities/default.mspx
Setting up Windows Live OneCare Family Safety to protect your children online
http://www.microsoft.com/protect/products/family/onecarefamilysafety.mspx
Hector Protector
This is a small download which provides a simple way for young children to deal with inappropriate content on their computer screen - Hector swims in the top corner of the computer screen and can be clicked on to provide a screen saver should inappropriate content be visible on the screen. The child can then seek and adult for help.