py launcher does not find my Python 2.7

I found the solution. The registry had wrong entries. As I have a 32 bit version installed I went to HKEY_LOCAL_MACHINE|HKEY_CURRENT_USER\SOFTWARE\wow6432node\Python\PythonCore\2.7\InstallPath and the value was set to C:\Python27 while my installation is in D:\Python27. So I changed all the registry values to match the correct location and it now works fine.

It's been quite a while I installed Python 2.7, but I assume I had Python 2.7 installed first. Then I deleted it and installed pythonxy in this new location. I probably didn't uninstall the previous version correctly.

I had a similar issue with Py Launcher failing to recognize my Python 2.7 install. I found editing the Windows Registry (Windows 10) by adding 2.7 to [HKEY_CURRENT_USER\Software\Python\PythonCore\2.7] solved my problem.

Other Window versions may have the PythonCore key in a different location.

Here is the full export of the tree I added:

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Python\PythonCore\2.7]

[HKEY_CURRENT_USER\Software\Python\PythonCore\2.7\InstallPath]
"ExecutablePath"="C:\\Users\\kcec11\\Python\\Python27\\python.exe"
"WindowedExecutablePath"="C:\\Users\\kcec11\\Python\\Python27\\pythonw.exe"
@="C:\\Users\\kcec11\\Python\\Python27\\"