There are a number of ways to simplify the reinstall. One is sysprep but as I've never liked it I won't elaborate. Another is to do what I do, which is to do a clean install and get the machine to the point where it has all the normally required software and is ready for use. I then use imaging software (plenty around, use Google) to capture tha state of the machine at that point. This allows a machine to be restored in about 10 minutes. This method is targeted specifically at doing each machine separately, not reinstalling on different hardware.