I messed with User permissions..  

Hi,

While trying to delete the old windows files after an upgrade it kept denying deletion because TrustedInstaller wouldn't allow it so I tried to change ownership from TrustedInstaller to to administrators group and things went down hill from here. apparently a 2nd group of administrators was created and by mistake I deleted the old (original) one, there is also a user called 'CREATOR OWNER' which I deleted too but shows up somehow on other files. It won't allow me to delete these files and asks for permissions from administrators which apparently now is a separate group.

How do I fix this cluster&$^&#? thanks.

For more illustration, this is what it looks like:

Hello and welcome to TenForums :)

If you have set up system restore points the simplest way to fix this is to revert back to a earlier point in time.

Or this:
Repair Install Windows 10 with an In-place Upgrade - Windows 10 Forums

To delete Windows.old you have to run disk clean when it's run then select system files and it will run again and include the folder once deleted you can't role back to old windows

Samuria said:

To delete Windows.old you have to run disk clean when it's run then select system files and it will run again and include the folder once deleted you can't role back to old windows

Ok, so I did this and there is still 1 GB that wont be deleted even with disk cleanup. It's important for me to get every possible GB because the space in C isn't very big at all so any advice on how to finally get rid of the old windows is appreciated.

the best tool is UnCleaner - Josh Cell Softwares very safe

hi again, Ive tried it but doesnt work, there is still a very stubborn 1 GB of windows files that wont be removed.

Atleast can some one confirm the remnants of the old Windows will be deleted on their own in a month? this trusted installer is really annoying I have to say...

Make a bootable USB flash drive or DVD of Kyki's recovery drive and use file explorer when booted into it to delete the files:
Windows 10 Recovery Tools - Bootable Rescue Disk - Windows 10 Forums