R help - Mar 2007 - tcltk, tclRequire and Tktable help

I know almost nothing about the tcltk library, and the
documentation seems very poor. What's the meaning of this
error, and is there any way to fix it? I'm running R 2.4.1
in a Windows XP machine where I have almost no privileges
(but at home I am the Evil Overlord of a Linux machine...)

library(tcltk)
tclRequire("Tktable")
# [1] FALSE
# Warning message:
# Tcl package 'Tktable' not found in: tclRequire("Tktable") 

Alberto Monteiro