I would like to do a test...
- Boot your windows normally and logon using the Administrator account
- right click the C: drive and access the security tab like you did before
- click Edit
- click Add
- type Administrators on the blank box
- click Ok
- back to the Permissions window select Administrators
- on the second panel Permissions for check all the box's on the Allow column
- click Ok
Can you add permissions to C: by doing this?