I recently reinstalled windows and I discovered I couldn't save files in C:\. (Btw my account is that of an administrator) After googling I tried various solutions because nothing seemed to be working. In the end I discovered that it just needed a reboot to work. One of the things I did was give all users full permissions through the Properties>Security tab of Disk C. Now I am a little concerned whether that was a good idea.
Which permissions can I safely disable?
I tried to disable them all again but got a warning that made me question the wisdom of that.
Can I remove ALL permissions for "authenticated users" and simple "users"?
Do Administrators belong only to the group of Administrators? If yes, I could probably disable all permissions from all other groups. Is that correct?
The other thing is that the Administrators permissions were already fully enabled before I messed with the permissions of other groups. So I am not sure what solved my problem of not being able to save on C. I also run a command on cmd, which I no longer remember... (because I found it on google). So maybe that did the trick.