
If anyone has this problem, try this:
http://www.pcreview.co.uk/forums/thread-1793028.php
Here's a last-ditch thing you can try. I haven't seen this solution
associated with the error you describe, but it certainly won't hurt. Use
Windows Explorer to search for all files on your hard drive with a .XLB
extension. Delete any that you find. Note that this may be a hidden file, so
you'll need to set Explorer to show hidden files before searching. Excel
uses these files to store information about toolbars, but they frequently
become corrupt and cause problems like this. Excel will create new versions
of the .XLB files it needs as soon as it starts up. Note that you will lose
any toolbar customizations that you might have made. Let me know how it
works.