Multiple users on multiple win7-64 systems.. Easy way to clone one?

Greetings, We have three medical clinics and the front desk staff float from clinic to clinic depending on their schedule. I only started here a few months ago and I am working on upgrading their Dell xp systems to Windows 7 systems. The problem begins to crop up when say a user named Sally will come in and sit down at this system for the first time.. Well, she needs to login, click on...