Suggenstions:
A) Flush the cache.
B) Go to the latest D6 version.
 
Nancy
 
Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. King, Jr.

From: Marty Landman

 I recently had the experience of installing the webform module on a
D6.19 site. It showed up on admin/build/modules as enabled and was
installed on sites/all/modules, but the config menu never showed up
even after clearing the cache and couldn't be reached by typing in
the url either.