Hi,
I’m still not sure what’s happening so I need your your help to debug it, I hope you are able to run some other tests.
Now i need you to open your Command Prompt as Administrator (like you did before) and run this 2 commands:
sc delete Cronservice
taskkill /F /IM node.exe
If you got a success answer from those commands try installing Prey again and let me know how it goes.