ruby 1.8.6 该版本的TK有问题，请大家帮忙看看！

C:\Documents and Settings\zhangqinjian>ruby -v
ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin32]
以下代码：
require 'tk'

安装了TCL，并且将两个DLL(tk84.dll,tcl84.dll)文件拷贝到BIN目录下

运行之后出现以下错误:
>ruby TestTk.rb
D:/Program Files/ruby/lib/ruby/1.8/tk.rb:1102:in `initialize': Can't find a usable init.tcl in the following directories:  (RuntimeError)
    {D:/Program Files/ruby/lib/tcl8.4} {D:/Program Files/ruby/lib/tcl8.4} {D:/Program Files/lib/tcl8.4} {D:/Program Files/ruby/library} {D:/Program Files/library} {D:/Program Files/tcl8.4.14/library} D:/tcl8.4.14/library



This probably means that Tcl wasn't installed properly.
from D:/Program Files/ruby/lib/ruby/1.8/tk.rb:1102:in `new'
from D:/Program Files/ruby/lib/ruby/1.8/tk.rb:1102
from D:/Program Files/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
from D:/Program Files/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
from TestTk.rb:71
>Exit code: 1

重新安装TCL，可还是不行！请各位讨论一下，关于RUBY的稳定性，再帮忙解决一下上面的问题？我认为不仅仅是我一个人碰到这样的问题？