PIL installation fails; registration problem

[GerritM]

I am reinstalling everything on my new Windows 7 laptop. I run into a problem when installing PIL 1.1.7, in combination with my Activestate Python 2.7.8.

The PIL installer complains that no Python is registered. I did run Joakim Löw's script to register Python. This results in the message "*** You probably have another Python installation!". Adding some code to this script reveals that my Python is registered with the following values (deviating from the values in the script):
installkey: C:\Python27\
pythonkey C:\Python27\Lib;C:\Python27\DLLs;C:\Python27\Lib\lib-tk

The script proposes for pythonkey: C:\Python27;C:\Python27\Lib\;C:\Python27\DLLs\

Can I change the pythonkey to the value proposed by Joakim Löw's script?