gdal ImportError in python on Windows

Trying to import gdal for Python 2.7.3 on Windows XP:

>>> import gdal
Traceback (most recent call last):
  File "", line 1, in 
  File "C:\Python27\lib\site-packages\gdal.py", line 2, in 

    from osgeo.gdal import deprecation_warn
  File "C:\Python27\lib\site-packages\osgeo\__init__.py", line 21, in     _gdal = swig_import_helper()
  File "C:\Python27\lib\site-packages\osgeo\__init__.py", line 17, in swit_helper
  _mod = imp.load_module('_gdal', fp, pathname, description)
ImportError: DLL load failed: The specified procedure could not be found.

Following suggestions from Installing GDAL with Python on windows? and elsewhere, here's what I've done so far:

The result is the same. Any other ideas about how to troubleshoot this?