oh yeah. You have to re-create user account with ASCII username if that happens.

And clearly those things are why there is C:\ProgramData\(that's under 8+3 characters!) since late XP era - even "C:\Program\ Files\" must have been too much sometimes, and having that folder is a useful harm reduction; developer response to app not working under Program Files is to make random top level directories under C:\, not taking time to clear dech tebts.