Networks ect

We have Wan not sure of all the stuff i have asked this question before. I have two pc that on boot up go straight to windows they do not get the option for LOGON, i have tried .pwl removal, and removed the autologon key in registry. They however if you log off windows will put up the logon box. but this is too complicated for our users to remember to logoff and logon to the proper network i need to get this fixed so that it works properly please help