备选：
1.Norton Online Family(免费版+高级版)
https://onlinefamily.norton.com/
2.windows live 安全设置(视窗系统自带)
http://windows.microsoft.com/zh-cn/windows-vista/protecting-your-kids-with-family-safety
http://support.microsoft.com/kb/975301/zh-cn
win7：
http://windows.microsoft.com/zh-cn/windows7/protecting-your-kids-with-family-safety
http://www.howtogeek.com/howto/10524/how-to-use-parental-controls-in-windows-7/
其他参考：
http://www.pcadvisor.co.uk/features/security/3286114/the-five-best-free-parental-control-programs/
http://www.techradar.com/news/software/applications/best-free-parental-control-software-9-programs-to-keep-your-kids-safe-1140315