调用PAMIE模块出错

调用模块ie=cPAMIE.PAMIE()时出错（已经安装相应模块）
import cPAMIE
ie=cPAMIE.PAMIE()
...

报错：File "D:\Python\Python27\Lib\site-packages\Pythonwin\pywin\framework\scriptutils.py", line 326, in RunScript exec codeObject in __main__.__dict__
  File "D:\Python\Python27\lib\site-packages\cPAMIE.py", line 64, in __init__
    self._ie = DispatchEx('InternetExplorer.Application')
  File "D:\Python\Python27\lib\site-packages\win32com\client\__init__.py", line 113, in DispatchEx
    dispatch = pythoncom.CoCreateInstanceEx(clsid, None, clsctx, serverInfo, (pythoncom.IID_IDispatch,))[0]
com_error: (-2147024662, '\xd3\xd0\xb8\xfc\xb6\xe0\xca\xfd\xbe\xdd\xbf\xc9\xd3\xc3\xa1\xa3', None, None)

请大侠指点，谢谢。

python 版本2.7，PAMIE 2.0
代码：
import cPAMIE
ie=cPAMIE.PAMIE()
ie.navigate('http://localhost/default.aspx')
ie.setTextBox('username',unicode('username','utf-8'))
ie.setTextBox('password','******')
ie.clickButton('loginsubmit')