Thank you for your reply, linney.
I did some research and found it's not possible to switch back to TrustedInstaller. Once you change owner from TrustedInstaller to administrator or someone else, you cannot change it back.
The reason, TrustedInstaller is not a user account actually. It's a Windows service. So be very careful on TAKEOWN.EXE. If you use it, you will break the security concern on ownership.
By the way, it's doable if you want to change ownership in programming way. But still, you cannot change back to TrustedInstaller.
AlbertP321