import pandas fails with cannot import name Timestamp / hashtable
I installed version pandas-0.11.0.dev-cddde22.win32-py2.7.exe but I always got the errors while importing pandas.Then I tried to install pandas-0.10.1.win32-py2.7.exe (without uninstalling the previous, I didn't know how to do, it didn't change anything. I have vista.
The error is 'cannot import name hashtable' if I use from pandas import *, or 'cannot import name Timestamp' if I use import pandas.

E:\work\work_pzt\measure_data\RNR283>python
Enthought Python Distribution -- www.enthought.com
Version: 7.0-2 (32-bit)

Python 2.7.1 |EPD 7.0-2 (32-bit)| (r271:86832, Dec  2 2010, 10:35:02) [MSC v.150
0 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.

> > > import pandas
> > > Traceback (most recent call last):
> > >   File "<stdin>", line 1, in <module>
> > >   File "C:\Python27\lib\site-packages\pandas__init__.py", line 25, in <module>
> > >     import pandas.core.config_init
> > >   File "C:\Python27\lib\site-packages\pandas\core\config_init.py", line 3, in <m
> > > odule>
> > >     from pandas.core.format import detect_console_encoding
> > >   File "C:\Python27\lib\site-packages\pandas\core\format.py", line 12, in <modul
> > > e>
> > >     from pandas.core.index import MultiIndex, _ensure_index
> > >   File "C:\Python27\lib\site-packages\pandas\core\index.py", line 13, in <module
> 
> ```
> from pandas.lib import Timestamp
> ```
> 
> ImportError: cannot import name Timestamp
> 
> > > from pandas import *
> > > cannot import name hashtable
> > > Traceback (most recent call last):
> > >   File "<stdin>", line 1, in <module>
> > >   File "C:\Python27\lib\site-packages\pandas__init__.py", line 6, in <module>
> > >     from . import hashtable, tslib, lib
> > > ImportError: cannot import name hashtable
