New computer, new to Windows 7. Can I disable the password feature on the start up screen?

I recently set up my new Dell Inspiron 660 with Windows 7; my wife and I are the only ones who use this computer. Rather than have to enter a password each time we want to use the computer I was wondering if there is a way to disable this feature so we can simply turn the computer on and use it; no need to enter the password.

Thanks