what a bunch of geniuses
listen to the previous post if you haven't installed power toys yet... they're awesome and worth it... the graphing calculator is especially good... its just like using a texas instrument... but i digress.
once you've installed them, go to the start menu, and click on Tweak UI from the powertoys menu...
you'll see an option for logon, then a submenu for autologon. just click the log on automatically at system startup option...