[BioPython] installing biopython

[Thenaturenook1 at aol.com]

Hi,
I am in the process of installing BioPython on a Windows XP System. I have  
been using the Windows installers throughout and following the  instruction in 
the PDF file. I have installed all of the compulsary pre  requisite modules in 
the order designated, but when i type the test code,  this AttributeError 
happens:
 
Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit (Intel)]  on 
win32
Type "copyright", "credits" or "license()" for more  information.
 
     ****************************************************************
Personal firewall software may warn about the connection  IDLE
makes to its subprocess using this computer's  internal loopback
interface.  This connection is not  visible on any external
interface and no data is sent to  or received from the Internet.
****************************************************************

IDLE 1.2      
>>> from Bio.Seq import  Seq
>>> from Bio.Alphabet.IUPAC import  unambiguous_dna
>>> new_seq = Seq('GATCAGAAC',  unambiguous_dna)
>>> new_seq[0:2]
Seq('GA',  IUPACUnambiguousDNA())
>>> from Bio import Translate
>>>  translator = Translate.umambiguous_dna_by_name["Standard"]
 
Traceback (most recent call last):
File "<pyshell#5>", line  1, in <module>
translator =  Translate.umambiguous_dna_by_name["Standard"]
AttributeError: 'module' object  has no attribute 'umambiguous_dna_by_name'
>>> 

Can anyone help?
 
thanks,tim