http://www.microsoft.com/athome/security/default.mspx

I recommend sharing Microsoft's at Home site with your family and friends.   It is an EXCELLENT home user security site in using basic terminology, an educational format, and promoting best practices. 

While I've been working with PCs since 1981 and in the security field since 1996, the training I've recieved helps me stay secure both at home or at work.   However, MOST computer users are not IT professionals including many of our family and friends.  This site might be a valuable point of reference and I plan to use it often in the future.