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Python Add-Ins return error messages like:
- ''Could not start the script component''.
- ''IOError: [Errno 13] Permission denied: 'C:\\Program Files\\Python26\\lib\\site-packages\\win32com\\gen_py\\__init__.py' pythoncom error: Unexpected gateway error''.

Python25/26 was installed in:
This is not the recommended path. Python25/26 always belongs to:

Recommendation: Install Visum and Python completely new:
1) Uninstall all Visum installations.
2) Uninstall all Python components.
3) Remove manually any folders like:
- C:\Python…
- C:\Program..\Python…
- C:\Program...\PTV_Vision\...
4) Reboot the computer.
5) Download the current setup for the latest Visum release.
6) First, install only this current setup, including 'Python' (do not change its standard folder).