cacls help

Hi, I was playing around in cmd with cacls permissions and I really F*cked up. I am an administrator. I put in cacls C: /p administrator:n and now whenever I try to change it to cacls C: /p administrator:f it says access denied even though I am an administrator. I was wondering does anyone know a way to get around this? Since I have no access to the C: drive now. And yes I did try to log in in safe mode with both administrator account and my named administrator account. In the administrator account i did the code but it only changed it for that account. I also tried it with my named account but it still says access denied. Is there any file I can open and remove the set permission or something? Thanks for your help.