you goSTARTCONTROL PANELUSER ACCOUNTSCHANGE THE WAY USERS LOG ON OR OFFand UNTICK "USE THE WELCOME SCREEN"
cheers,
DAN
Download Ubuntu from http://www.ubuntu.com/. Burn the ISO and insert it into your drive. Restart from the CD / DVD. Follow the instructions to install Ubuntu and ... voila your XP welcome screen will be there no more.