Projects that still support Python 2.4 are building distributions with either 2.4.x or 2.5.x versions, because they afraid that newer installers won't run on Windows XP or Windows 2000.

http://trac.edgewall.org/ticket/9404#comment:2

Unfortunately, these installers fail to create uninstall keys with an error like:
Could not create
    scons-py2.6
Could not set key value
    Python 2.6 SCons - a software construction tool
Could not set key value
    ...\Python26\Removescons.exe" -u ...

This is similar to http://bugs.python.org/issue600952 that was reported for Python 2.1 / 2.2 long ago.

http://scons.tigris.org/issues/show_bug.cgi?id=2533
http://trac.edgewall.org/attachment/ticket/9404/win7_install_warnings.png

There is some uncertainty that 2.6 package installers are dependent on msvcr90.dll - http://trac.edgewall.org/ticket/9404#comment:7

as I said in the other issue, there's no bug fix for 2.4 or 2.5 anymore, unless it's a security issue. So I am closing this issue.

Also, your second message seems unrelated. If there's an issue with a dependency under 2.6, please open a distinct issue and explain in detail what is the problem.

Python process is rigid, no surprises here. But this issue is nevertheless useful to link packages that experience this problem. I'll bump it every time I run into broken package. So far I use:

1. SCons
2. Trac

Please don't add messages in here just to list the projects that suffer from a bug in Python 2.4 or 2.5. This is just making us extra triage/read work for nothing, and doesn't really help.

Your first report is enough so the error and its references are indexed by the search engines. Thanks for them.