Uninstalling and reinstalling Miniforge breaks all shells

- [x ] I read [the conda-forge documentation](https://conda-forge.org/docs/user/introduction.html#how-can-i-install-packages-from-conda-forge) and could not find the solution for my problem there.

Issue:

After transitioning from Anaconda to Miniforge, I had a few issues with VSCode and imports were broken. I decided to start from scratch again, and uninstalled both VSCode and Miniforge, cleaned up all files, and installed Miniforge again.
After installing I noticed a "Miniforge Prompt" in the start menu; i tried launching it, but nothing happened.
I would have expected a command prompt to open and have the base environment activated.


After that, I noticed that it seems ALL shells have been broken.
Windows Command Prompt has the same problem as Miniforge Prompt, namely it does not open at all.
Windows PowerShell opens, but throws an error at me saying "running scripts is disabled on this system".


I am at loss.