Hi there, I've prepared a Tablet Acer W700 with Windows 8 Pro, then I joined the domain on Admin server then it work perfectly fine. But now I've a same problem with you only when our Virgin Media internet is down. Everyone in Admin side can sign in Admin server, but only only one person she can't sign in her account in Windows 8 but Windows XP and 7 are fine. Can anyone have that experience and able to assist me please. Many thanks in advance.