This error resulted from a Microsoft security update that was published on Tuesday, Apr 10, 2012. This update disables a Visual Basic runtime dll that is required by several Pathagoras features. The specific routine that is disabled is 'TreeView' found in several modules. Even if fyou don't use TreeView features, the update disables Pathagoras nevertheless.
To reenable the file, you simply need to delete any "*.ndx" files that should have been removed by Microsoft during the updata.
Navigate to c:\documents and settings\USERNAME\Application Data\Microsoft\Forms and delete any ndx files you see there.
Then, Navigate to c:\users\USERNAME\AppData\RoamingMicrosoft\Forms and delete any ndx files you see there.
If this does not resolve the issue, contact us immediately and we'll get to work on getting you back up and running. Call us at 866-728-4246 (tollfree) or write to us (info@pathagoras.com).
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If you know that you were not affected by the April 10th update update, but are receiving the above error message, the other (releated) cause of the problem may be that you have recently installed Ofice 2010 in its 64 bit iteration. Be advised that Pathagoras (and many other add-ins) cannot operate in that Office 64 bit environment. (64 bit Windows is fine. 64 bit Word is the problem.)