I have a Promise NS4600 SmartStor with 4 2tb HD. Has been working fine. I upgraded to windows 8.1 from windows 8 on all of my pc's now I cannot connect to the NAS. I try doing it with the mapped drives and it says they are already in use. I try to asscess over the web and is says cannot be displayed. All of the lights on the NAS show they are working properly, the net light flashes and all. Any ideas?