I am using a Windows 7 Ultimate OS, and my dad recently changed the setting in the sharing tab of my C drive to make it more private when I was using a shared network. Unfortunately, something he did made it so I can no longer access my drive. When I check the owner of the drive it says it is "unable to display current owner." The blue and yellow shield are on all the edit and security buttons making it impossible for me to click them. I have even tried reinstalling windows from my disk, but the computer says I am not authorized to do this.
Other things I have tried:
Using command prompt: takeown /f C:\ and then when that didn't work, C:\ /G everyone: F
I even set up the built-in administrator account, but the blue shields are on the buttons there too.
When I try to click on something with a blue shield next to it, the box flashes, but nothing opens.
When I try to open the C drive it says, "C:\ is not accessibly. Access is denied."
I do hope you can help, I am quite desperate at this point!