Create an Invisible Account in Windows XP !!

You can prevent an account from appearing on the Welcome screen, thereby creating a “hidden” account. (It’s not completely hidden, because the account is visible to administrators in Local Users And Groups, and the account’s profile in the Documents And Settings folder is visible to all users.) Use Registry Editor to open HKLM\Software\Microsoft\Windows NT\ CurrentVersion\Winlogon\SpecialAccounts\UserList. Create a new DWORD value, setting its name to the user name of the account you want to hide and leaving its value set to 0. Be careful with this trick: You won’t be able to get to the account with Fast User Switching because the account doesn’t appear on the Welcome screen, and pressing Ctrl+Alt+Delete two times at the Welcome screen to display the Log On To Windows dialog box works only when no other users are logged on. Therefore, if you want to use this type of hidden account, you should either disable Fast User Switching or resign yourself to using the account only when no one else is logged on.