keyword help in Pythonwin interpreter

[BartlebyScrivener]

Using ActivePython 2.4.3 on Windows XP

While in the Pythonwin IDE, if I seek keyword help by issuing the
following command:

>>>help ('while')

I get:

Sorry, topic and keyword documentation is not available because the
Python HTML documentation files could not be found.  If you have
installed them, please set the environment variable PYTHONDOCS to
indicate their location.

My PYTHONDOCS variable is set to:

c:\python24\Doc\Python-Docs-2.4.2\ref

which appears to be correct (ie the help html files are installed
there).

Searching this group, I found someone else complaining about the same
behavior with no clear resolution.

http://tinyurl.com/pblev

Any advice?

rick