I have the same problem with Windows 8. This morning when I went to check my ASUS Zenbook laptop, the PC wouldn't access the network, even tho I could see our home network was working. I did a hard reboot and returned several minutes later to find I had been logged in under a temp password and all the desktop files I had were in the trashcan. Here's the error message that popped up in the lower right of the task bar:
"You've been signed in with a temp profile. You can't access your files, and files created in this profile will be deleted when you sign out. To fix this, sign out and try signing in later. Please see the event log for details or contact your system admin."
When I try logging out and then back in, I get the same problem. One other note: During the login procedure, this text appears in the bottom right of the screen:
"Windows Update. Your PC will restart in 2 days to finish installing important updates."
Any help you could offer would be greatly appreciated!