Replace user profile with default in XP

I am setting up a group of workstations that I have locked down. What I want to do is to overwrite

the "user" profile with my default profile on reboot. In doing so, whomever sits at the workstation

will receive the same desktop and users making any changes will not be saved. I would prefer to

do this with a logoff script because I already have one in place. Hopefully someone has done this before

and it will be a quick and east fix.