When you use the
Open command and the Office program detects that the drive it has been
working with is now unavailable, the Office program will change the focus back
to the hard disk. After changing the focus of the Office program to an
available drive, you can click a Help topic, and the Help topic will be
displayed.
For additional information about related problems with
Help, please click the article number below to view the article in the
Microsoft Knowledge Base:
237355
OFF2000: Cannot Use Help or No Results Returned from Search
239913
OFF2000: Help Does Not Appear When Clicking Help Topic