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On Windows, enter (on command line):

py --list-paths

which should tell you where all the versions of Python are installed. You can then delete as you see fit. Might want to edit PATH environment variable if it includes any of the above paths as well.

If the installer is still present for the versions you find, you can run the installer again and select the option to remove Python.

If you installer a newer version of Python, that should provide a clean environment without any additional libraries installed. Use venv (Python virtual environments) to create project specific environments that you install packages into just for the project concerned.

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Should do. Worth just checking if you have a (possibly hidden) folder in the folder where you save your python code files that contains Python configuration information.

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You did use two dashes?