Stuck at login screen without password box & only cancel button

I'm having trouble logging into one of my Desktops with Windows 7. I had simply locked my desktop and when I came backup, on waking up the monitor, I noticed that the screen shows the text "Press ctrl+alt+del to login" with the Windows 7 logo underneath
on a black background. This used to be the default blue wallpaper earlier. On pressing ctrl+alt+del as usual, I see no user account displayed and no text box to enter the password. Only the "Ease of Access", "Cancel" & Shutdown buttons are showing
on a black background. I can't enter the password anywhere. I restarted the machine to check if the problem disappears but to no avail. It still doesn't gives me the password box and a black background.
I've tried memory tests and startup tests from the boot menu and its still not fixed. Even safe mode gives me the same login screen without a place to enter my password. When I try to Remote Desktop to this machine from another machine, it gives me the same
3 buttons on the default wallpaper and no place to enter the password or select a user.
Any ideas on how to fix this. Any help will be really appreciated.

According to your description, please try the following methods for a test.
Method 1:
I would suggest you to run SFC scan to check for missing or corrupted system files.
Run System File Checker (SFC) scan to fix any corrupt system files. To do this, follow the steps mentioned in the link :
How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7
http://support.microsoft.com/kb/929833
Method 2:
I would suggest you to perform a system restore
You can refer the link:
http://windows.microsoft.com/en-US/windows7/products/features/system-restore
If there is not any working Restore Point, please compare the following 2 registry tree with a working computer.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify
Best regards,
Della Li

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