Cannot create file right click the folder you want to create the file in and then click properties

Create a new Folder in any location.
Select Security, and give full permission to everyone.

Open REGEDIT.. 
Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Security

Select, OutlookSecureTempFolder and give the new path to the directory created previously..

Re open Outlook..