How do I change default printer for all current users in Windows 7

I need to find a way to change the default printer for all current users in Windows 7 Pro. The computers are in a domain but group policy comes from the local computer so it has to be a local fix. I am able to change to set the correct default printer for all new users but can’t figure out how to change it for all users who have used the computer prior to the printer being replaced. Has anyone found a way to do this? At this point I am willing to try anything other than re-imaging the computers. It is a mixture of desktops and laptops. I have searched the web and tried everything I could find but haven’t found anything that actually works. Any and all suggestions are appreciated. Thank you.