A number of readers have commented about problems they're having with getting Skype to work on their Windows 7 machines. Skype, for the uninitiated, is a free service that allows you to make calls, both voice and video, to other computers that also have Skype installed.
I use it all the time to talk to my daughter in college, and love it. I don't have any problems using either the voice or video functionality in Skype, but other readers have. If that's you, please respond below or email me directly. If there's enough response, I'll contact the company and see if I can find out what's going on.
In the meantime, I highly recommend downloading, installing and using Skype. It's always worked well for me -- and you can't beat free!