Eliminate Logon Screen At Bootup?

My query is only a small issue - but it is something that bugs me a lot!
I run a standalone desktop PC using WinXP Pro (SP2) and usually set it to boot-up whilst I do other things around the house. Inevitably I come back to find the machine is stuck at the logon screen, which means I have to go through the process of logging in - and then wait for the boot-up to finish.
As I am the only person to use this PC is there some way I can disable or bypass the logon process to enable the boot-up process to conclude automatically?
Many thanks for any help or advice.

run control userpasswords2