NTFS Permissions
Access denied. Can´t do anything, even takeown. It says: “Program cannot open required dialog becasue it cannot determine whether the computer named “ADVirtualDisk” is joined to a domain.”; Then: “Unable to display the user selection dialog. The RPC Server is inaccessible. But is not. Whateaver.
How-to: Remove the drive letter, using disk management. Then, set the disk offline. Then, online. Properties of the partition, security and things appeared, at least. Now, you can change the owner, and everything should be back to normal after a while, depending on how many files you have, how fast is your PC, etc.