Python on Windows XP 64-bit: python not found in registry - Python

After first trying to install the beta of Python 2.6 on my Windows XP
64-bit machine I finally succeeded installing 2.5.2. But I still have
a some problem: Installing iPython, PIL, easy_install etc fails saying
that python.exe cannot be found (although I can start the python
interpeter just fine). The problem is that python cannot be found in
the registry. I tried Effbot's solution of adding Python to the
registry, but that doesn't help:

http://effbot.org/zone/python-register.htm

Anybody here that had the same problem and solved it?

Thanks.

2B