ImportError: No module named numarray

[enas khalil]

dear all
could you tell me how can i fix this error appears when i try to import modules from nltk 
as follows
 
from nltk.probability import  ConditionalFreqDist
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in -toplevel-
    from nltk.probability import  ConditionalFreqDist
  File "C:\Python24\Lib\site-packages\nltk\probability.py", line 56, in -toplevel-
    import types, math, numarray
ImportError: No module named numarray

 
thanks 

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