Windows 7, QuickTime, and Xtra folder error message

I am using a Laptop w/Windows 7, running latest versions of QT and Shockwave (just downloaded them).  I am on website http://virtuallabs.stanford.edu/demo/ and I get the missing Xtra folder when trying to watch videos.  I need this for school homework.

See Troubleshooting issues with iTunes for Windows updates.
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