Password reset help

Can't figure this out one out. My buddy forgot his password to his desktop and laptop, which are both the same, so he can't login to anything right now. Need to know if there is a way to reset the password so he can login. I have 100% no idea how to get into windows or how to reset his password. He's running windows 7 that should help

Alright I'll try that. See if it works here in a bit

That didn't work. He has home premium. He remembered his password finally so it's good now but I'm still kinda curious how one would go about it. Never tried it on 7 but on Vista I could do it. Doesn't work the same way apparently.

ERD Commander - Download ISO and burn to CD, boot of CD > lock smith > reset

(assuming you can boot from CD and you are talking windows)