Here I’m showing steps to hide a user account in Windows 7.
The user account can be hidden from welcome screen but can be used while sharing etc.
Steps
Create a new account from User Accounts
Make the following changes in registry
Goto HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\CurrentVersion\Winlogon\SpecialAccounts\Userlist
Create a new “KEY” if “SpecialAccounts” is not listed, under special accounts create “userlist” too (again KEY).
Create a new “Dword 32 Bit value” with name of the created account name with the default value “0” (Zero), If Dword value is “1” account will be shown.