I 'm unable to run rpy2 in python.

with this code

 import rpy2.robjects as robjects

Here's the full exceptions:

RuntimeError: R_USER not defined.

File "d:\py\r\r.python.py", line 1, in 

  import rpy2.robjects as robjects

File "c:\Python27\Lib\site-packages\rpy2\robjects\__init__.py", line 17, in <module>
  from rpy2.robjects.robject import RObjectMixin, RObject

File "c:\Python27\Lib\site-packages\rpy2\robjects\robject.py", line 5, in <module>
  rpy2.rinterface.initr()

I'm using window xp win32 Here're my locations:

C:\Python27\Lib\site-packages\rpy2\robjects\robject.py

C:\Program Files\R\R-2.15.0\bin\i386\R.exe

C:\Python27\python.exe
python r error-handling installation
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