Logon Fails After Password Expires.

On an NT Domain the Passwords are set to expire after 20 days. After 20 days the passwords on all (win2kpro and Win98se)expire and all users are required to change their passwords at login (as set in User Manager for Domains)Two win2kpro PC’s are fialing to allow the users to log back onto the Domain. If I try to logon useing my own account i am logged on without a problem, but as soon as the two users try to logon to the domain with win2kpro they are denied. I have cleared their passwords on the server and on the local PC. They are able to log onto the domain if they use Win98se PC’s. Where to Next!!???