Thanks for the email. There is a problem running the built-in webcam extractors on some versions of windows (due to interactions between Windows, Processing, and Quicktime), but I've built a replacement color tracker that should work. It's been tested on a few machines, but not widely, so please let me know if you have any problems with it.
You can download it here:
http://code.google.com/p/wekinator/downloads/detail?name=new_colortracker.zip&can=2&q=
Good luck!
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Rebecca Fiebrink
Assistant Professor of Computer Science (also Music)
Princeton University
www.cs.princeton.edu/~fiebrink/