Fog Creek Copilot (<a href="http://copilot.com/" rel="nofollow">http://copilot.com/</a>) one-ups this by allowing you to just <i>fix</i> the broken machine--and it's free on weekends.  No, it's not perfect, and yes, Show Me What's Wrong and its ilk definitely have their place, but if it's just family and friends, why not cut out the frustrating reinterpretation of the screencast?