Tech ARP posted a simple guide on how you can get Windows XP to automatically log you in everytime it boots up
>> Automatically Logging Into Windows XP
Despite Microsoft's relentless efforts in promoting Windows Vista, Windows XP is still going strong and is unlikely to go away anytime soon. So, here's a really useful tip for those of you who are still using Windows XP.
If you are one of those who have always wished you do not have to log into Windows XP manually, here's a simple guide on how you can get Windows XP to automatically log you in everytime it boots up. Just follow the simple steps and you will no longer need to do so.
>> Automatically Logging Into Windows XP