You probably need to take ownership away from TrustedInstaller and give it to yourself. There are probalby several places that will give instructions on how to do this, and maybe try the link below. But after you take ownership, make sure an OK your way back out of the Security dialog and then go back into properties, security to give yourself full control of the files/folders.
Also, make note of the areas where it mentions inheriting the permissions so you don't have to go in and change each file separately.
Take Ownership of a File or Folder