import pylab partition problem

I have an interesting problem importing pylab. Most of my work is stored on a FAT32 partition so I can access it from windows or linux. If I run python from a dos command open on that partition I get:

E:\pythonscripts>python
Enthought Edition build 1069
Python 2.3.5 (#62, Mar 22 2005, 21:53:13) [MSC v.1200 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import pylab
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "C:\Python23\Lib\site-packages\pylab.py", line 1, in ?
    from matplotlib.pylab import *
  File "C:\Python23\Lib\site-packages\matplotlib\pylab.py", line 199, in ?
    import backends
  File "C:\Python23\Lib\site-packages\matplotlib\backends\__init__.py", line 15,
in ?
    raise ValueError, 'Unrecognized backend %s' % backend
ValueError: Unrecognized backend WxAgg
>>>

But if I do the same things from a dos prompt open on the C partition it works fine:
C:\Documents and Settings\Ryan Krauss>python
Enthought Edition build 1069
Python 2.3.5 (#62, Mar 22 2005, 21:53:13) [MSC v.1200 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import pylab
>>>

How can this be fixed?

Thanks,

Ryan