Error Message:

Registry Editor could not set security in all subkeys. The key currently selected contains one or more inaccessible subkeys.

Explanation:

This key cannot be accessed. It has probably been deleted by another process since the Registry Editor window was last updated.

User Action:

Choose Refresh All or Refresh Active from the View menu to refresh the screen. Or enable Auto Refresh (in the Options menu). If the problem persists, the Registry might be corrupt.