After digging a bit, somehow it's something in system32. Which obviously comes back after being deleted.
Totally normal and not fishy behaviour there, Asus
After using Autoruns to removethe registry startup item, it's gone, which I'm glad about but it's completely wild that I have to go to these lengths to do something as trivial as "stop that random popup from showing up on boot".
I don't miss Windows as my main OS 🙄
Alright, now that this is sorted out, time to play some Half-Life Alyx
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