1. Run The Registry Editor in Windows XP/Vista/Win7 by going to Start Menu > Run or by hitting theStart Menu Key + R key> type: regedit and hit enter. You will need to run this from an account that has Administrative rights.
2. In the Registry Editor window, go to:
HKEY_Local_Machine\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList
3. Right-click on the UserList folder on the left pane and choose New > DWORD (32-bit) Value
Use the username of the account you want to hide as the value and hit OK. It will show up in the right-pane. Exit the Registry Editor
Voila, your account should no longer show up on the Welcome / Login screen or in the Control Panel > User Accounts area.
–To unhide the account, just go back to the same registry entry/location and delete the key with the name of the account.
