VB Help does not display Excel information
 

For some reason, when I try to look up MS Excel related information in Visual
Basic help, it no longer displays any information. For instance, if I select
"Workbook Object" from the index, all I get is a blank sheet. This has just
started. Yesterday, I could find this information.

I have been unable to locate anything that has changed. Can someone tell me
what I need to do to get this help information back?