I'm using a Canon Powershot Pro90IS digital camera and having
difficulty downloading onto Zoombrowser.  Zoombrowser says its
corrupted and my error code is:  0x80040680    What's the problem? 
What's the solution?  I've tried to uninstall and reinstall to no
avail.

I've had a similiar problem and it turned out to be caused by a
corrupted picture database.  There is an option that lets you rebuild
a new picture database from a directory tree somewhere on the file
menu.  This is a VERY time consuming process (several hours in some
cases if you have a large number of pictures), but it did seem to
solve the problem for me.  Also, I reommend downloading the latest
version of Zoombrowser from Canon's website.  There are a lot of new
features and bug fixes. 
http://www.powershot.com/powershot2/customer/psswup.html

Good luck!