Problem Description:
Windows 7 Ultimate on Hyper-V Virtual Machine hosted by a 2008 Server R2 SP1.
It was running last night under my account "Foo" when an automatic reboot had occurred due to Windows Update running overnight. I was presented with the welcome screen but the user account Foo is no longer displayed as a logon option, just Administrator.
Details:
Windows Update installed these 2 updates: KB2533552 and KB2534366. Subsequent reboots did not fix the issue.
I can see the account Foo in Computer Management/Local Users and Groups and it looks normal (is not disabled), but I don't see it in Control Panel/User Accounts and Family Safety/User Accounts/Manage Accounts. All I see there is Administrator and Guest (off). The profile folder is still there.
I don't feel comfortable doing what is recommended here. Besides, C:\Users\%username% or C:\Users\Temp do not exist on this machine.
Things here look normal: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList - no keys with .bak extensions.
When I try a system restore to a point before the Windows Update I get "System Restore did not complete successfully..." "The file or directory is corrupted and unreadable".
Any ideas on how to make the Foo user account show up again so I can log on with it?
Answer
I discovered that the "Foo" account lost it's membership to the Administrators group. This is what got changed, apparently, by Windows Update. Once I added Foo back in to the Administrators group it appeared back on the welcome screen.
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