(b) ntuser.Dat
registry
I think you meen by profile system settings. Go to settings, system settings.
Go to your settings > little cog in upper right > profile settings > allow public profile > no
Go to settings, and then the first thing in settings is your profile image selection!
You click your profile picture, then hit the settings button.
Hkey_users
Every user profile created on a Windows operating system has an NTUSER.DAT file. A user profile contains personal files and preference settings that are specific to each user. For example, each user profile contains a unique Documents folder, Start Menu configuration, desktop properties, browsing history, etc.
Just click on Edit profile in your profile.
go to edit profile then profile settings then yur there..
You can find the settings for one's Profile Pictures on Facebook by going to your Facebook account. Go to Privacy Settings. Then go to Customize Settings. Once there you can change the settings, if desired.
Just change your privacy settings.
Go to settings>Profile and change the profile pic.