Баги новой бэты 5.1.1130.26 / Bugs of the new beta 5.1.1130.26

[Admini]

I don’t run it as Administrator, I have User Account Control turned down to a minimum, and I don’t need it at all
and I don’t even launch the browser from the C drive. but as you can see, these folders are created anyway.

Without UAC, standard users in Administrators group have Administrator privileges.
You can try turning on UAC, and check whether it still use Program Files.