I have installed Windows 7 and create another user without administration right. Thereafter by modifying registry HKLM/SOFTWARE/MICROSOFT/WINDOWSNT/CURRENTVERSION/WINLOGON/ create SpecialAccount/Userlist and hide the user account having administrator privilage. On the Welcome Screen when i push CTLR+ALT+DEL nothing happens. Is there anyway to modify registry or restore hidden account. Thanks for your interest and support.