I've been playing with my C: drive permissions and I have managed to mess them up. Now when I log in nothing appears and I can't launch anything. I tried safe mode and the same thing happens with that.
I can't even launch cmd.exe and it says that "I don't have the permissions" even though I am the admin.
I tried to use the command prompt in repair mode but when I choose the language it says the Parameter is incorrect and then restarts.
I have a Windows Server 2008 R2 with AD installed on it. What should I do?