You may want to hide the admin or some other accounts for privacy purpose. If you are having public cafe or organization or school ,then you probably need.  I am going to guide you in this article to hide the Acccounts in Windows system.

• Now go to start->run
• Enter as "regedit" to open the registry window.
• Navigate to this Path:
  

  HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\CurrentVersion\Winlogon\SpecialAccounts\UserList

• In the Right pane, Right click -> New -> String Value
• Right click on the new String Value and click Rename
• Enter the Name of the Account you want to hide.
• Right click on the String Value  and Change value to 0 which hides it. If you want it to be Visible to all Enter the Value 1.
• Now Save and Exit the Registry  Edit.

Restart the system.
When you login if you want to access the hidden account,then just press
"ctrl+alt+del" in login page.
Enter your hidden account and password.