Problem installing GDAL and fiona module in arcmap10?

I am getting message like this

Traceback (most recent call last):
File “”, line 1, in
File “C:Python26ArcGIS10.0libsite-packagesgdal.py”, line 2, in
from osgeo.gdal import deprecation_warn
File “C:Python26ArcGIS10.0libsite-packagesosgeo__init__.py”, line 21, in
_gdal = swig_import_helper()
File “C:Python26ArcGIS10.0libsite-packagesosgeo__init__.py”, line 17, in swig_import_helper
_mod = imp.load_module(‘_gdal’, fp, pathname, description)
ImportError: DLL load failed: The specified module could not be found.