This is a stupid question from a newbie. I have installed the windows version, and I wanted to try a graphic example from the 'pragmatic' using tk. 

require 'tk'
TkLabel.new { text 'Hello, World!' }
Tk.mainloop

I tried to substitute 'tk' with the path to tcl\bin\tk83.dll, then to \tcl\lib\tk83.lib, but every time with a load error.
How do I run this example in the standard windows installation?
Audun