Error with "Not found: win32com.client"

[David]

I copy the code from "Learning Python" charper10, and it report the error:

Traceback (most recent call last):
  File "C:\MyCode\Python\Noname1.py", line 3, in ?
    from win32com.client import constants, Dispatch
ImportError: No module named win32com.client

Where I can down/inst this module? Thanks!~