Windows 10: How to change security of C drive from administrator to TrustedInstaller

Earlier I have changed the security of whole C drive from trusted Installer to Administrator but now I again want to set it as TrustedInstaller because every time while performing any action line downloading software, opening software it as for administrator password and also there is a UAC shield.I just want to set the security of C drive as a new laptop.

:)

 

Changed the ownership of C:\windows on 2016 server from trustedinstaller to administrator and changed back

Hi Everyone,

Please help me with the following concern.

On my 2016 server i changed the ownership of C:\windows from Trustedinstaller to local administrator. I had also unknowingly selected the option to apply it to sub folders and files. Noticed it had changed ownnership on all the subfolders in C:\windows
to Administrator.

Post this i changed ownership back to Trustedinstaller, and no permissions were changed.

Now i see all folders in C:\windows , owner as Trustedinstaller. On another 2016 server i found that some subfolders have the ownership set to system in C:\windows.

Will the existing ownership of C:\windows and its subfolders to trustedinstaller cause any problem? If yes how do i reset the ownerships to defaults. There we no permissions changes done.

Thanks,

 

Can't edit permissions or add new users to C Drive. (FIXED, SOLUTION IN OP)

FIXED: Last ditched attempted at fixing this, thanks to Reddit. Saved me a lot of time instead of resetting PC

Step 1: On the drive with the issue (my case it was the C Drive), right click it and select properties. Under the security tab click Advanced, then at the top next to Owner change it to you (name/whatever your account is called), instead of TrustedInstaller.
Click Apply then OK.

Step 2: Exit out and fix the Administrator and User permissions by rechecking the boxes that you accidentally unchecked. Hit Apply then OK.

Step 3: Restoring TrustedInstaller as Owner (important step) follow guide: http://www.thewindowsclub.com/restore-trustedinstaller-as-owner-windows

Step 4: After restoring TrustedInstaller, hit Apply then OK.

Fixed.

Thanks all that helped, and good luck!

 

TrustedInstaller deleted

Hi all.

Newbie here. I've made a grave mistake by deleting "TrustedInstaller".
Before that I've took over the permissions of my C:\ OS drive and gave them to my only Administrator account.
Now I can't open C:\ drive, install any programs besides Google Chrome by some reason.
Already tried restoring system from a backup date 2 times. It didn't help. First time before 3 days ago, next time from a month ago. I've used the Reset option of Windows to get back to manufacturer settings. Nothing.
Tried to add back "TrustedInstaller" to the list of Advanced Security Settings of drive C:\ by "NT Service\TrustedInstaller".
Doesn't help. Same error as every time. Acces for all the accounts is disabled. Windows Troubleshooter also not responsive cause of the permissions. Basicly most of the things I'm trying to do I'm not being allowed to.
Any help will be appreciated. I know I've screwed up. Is there still anything I can do instead of clean install?


Microsoft Windows version 20H2 (OS build 19042.630)