Hide Users on the Welcome Screen

When you add an account for certain users with Windows XP, their user names will appear on the Welcome Screen. Sometimes a user needs to be added to a Windows XP machine, because he needs access (via the network) to resources on the machine, but he will not be physically logging in on the computer. You can remove his name from the Welcome Screen, while still maintaining the user account.
Start the Registry Editor
Go to HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows NT \ CurrentVersion \ Winlogon \ SpecialAccounts \ UserList \ Right-click an empty space in the right pane and select New > DWORD
Value Name the new value exactly as the Username Leave the Value data as 0
If you want to enable this user again on the Welcome Screen, either double-click the Username value, and change the Value data to 1, or delete the Username Close the registry editor

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Launch Programs at Login...

Launch Programs at Login Without Using the Startup Folder

This tweak allows a program to be launched when the user logs onto the computer. It can be set to run minimized and there is no trace of the executable in the Startup folder on the Start Menu nor in the Documents and Settings folder accessible via Windows Explorer
[Start] [Run] [Regedit]
Registry Key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunModify/Create the Value Data Type(s) and Value Name(s) as detailed below.
Data Type: REG_SZ [String Value]
// Value Name: [Enter the Name of Program Executable]
Value Data:
[Enter the Path to the Program Executable]
Exit Registry and Reboot