Just a quick web search turned up these. I don't think this a PowerShell problem, though:
https://forums.tomshardware.com/threads/completely-corrupted-net-framework.3542479/
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The shell cannot be started. A failure occurred during initialization:
The type initializer for 'System.Net.ServicePointManager' threw an exception.
[process exited with code 4294901760 (0xffff0000)]
You can now close this terminal with Ctrl+D, or press Enter to restart.
that's the error I am getting again and again
Just a quick web search turned up these. I don't think this a PowerShell problem, though:
https://forums.tomshardware.com/threads/completely-corrupted-net-framework.3542479/