Go to the toribash>custom folder.
Delete his folder. So if you don't want see zwouter, delete the folder called zwouter.
Create a new folder with his name, so in that case it would be a folder named zwouter.
Go to properties>security>edit.
Deny yourself (probably admin user) to edit the folder. If that doesn't work, deny everything, if that doesn't worky, deny everything for everyone.
Just tested it myself and it worked.
Edit, seems like software123's thing worked, closing.