I understand. No it's not possible. But you can get windows to log you in automatically if you want

login in automatic? when i dont set a password you mean?

You can still have a password but you don't have to enter it on the local pc to login
I realize it is not ideal for every situation, but for a desktop computer in your home it might be want you want.

http://www.howtogeek.com/howto/windows-vista/make-windows-vista-log-on-automatically/

works fine, thanks.