No Python in registry after ArcGIS 10 install

I hav installed ArgCIS desktop on my computer,including Python (v 2.6)

I'm now trying to install a python module that requiers Python 2.6 but the installer will not install because it can't find the Python installation in the registry. Obvoisly the ArcGIS installer does not create an entries in the registry for its Python installation.

How do I gi about do add it manually?