Faster XP : Not Displaying Logon, Logoff, Startup etc Msgs
Not Displaying Logon, Logoff, Startup and Shutdown Status Messages
To turn these off:
Start Regedit
Go to HKEY_LOCAL_MACHINE\SOFTWARE\m*cro$oft\Windows\CurrentVersion\policies\system
If it is not already there, create a DWORD value named DisableStatusMessages
Give it a value of 1