Can not delete RT7lite's leftover files

I installed RT Seven Lite Software for making my own Windows 7 custom ISO. I loaded official Windows 7 ISO into RT Seven lite and started editing, But for some reason i stopped working on that. The problems is i uninstalled RT Seven Lite and i thought the windows files i was working on will be delete automatically but this didn't happened. Now i have left over windows 7 setup files that i can't delete. When i delete files it gives error '' You require permission from administrators to make changes to this file/folders''. But i am on administrative account.
And even if i try to change ownership of files/folders the options are not accessible. Only Trustedinstaller have full control on files. (My English is not good so please watch video to understand my problem)

Details - YouTube

I even tried to use Linux Fedora OS to delete those files but still failed. Those files took 32GB size on my HardDrive. I don't want to format my drive.Help please

Have you tried this one? Add "Take Ownership" to Explorer Right-Click Menu in Win 7 or Vista
99% of times that's all that's needed here to get rid of stuff. But a (very) few times had to manually add\edit owner in 'Advanced Security Settings', info here Permissions - Allow or Deny Users and Groups

btw, in case it's something very special to your program, try a ticket on RT Seven support?

Thank you man. That registry tweak (take ownership) worked well. I got back my 32GB space from windows drive. Thank you again and keep up the good work.

That's great. Thanks for reporting back.