Here is a simple tip to automatically login a user.
Click on the Start orb and type netplwiz (Advanced User Accounts Control Panel) in the Instant Search Field.
On the Users tab, uncheck the Users must enter a user name and password to use this computer.
Click the Apply Button and the Automatically Log On button appears for you to enter the User name and password information.
After entering this information, the computer will automatically login for the account specified.
Note: I use this feature on my laptop and have the account automatically login for my Standard User Account. I would not do this on my Administrator Account. You can if security isn't an issue for you.