Login in Issues

When we loging to the 98 computer which is a member of a domain with user
policies, no matter who we login as we get the student policy setting and
cant get to anythign liek the c drive and what not.

This is only happening on a few machines so im guessing that the problem is
on the workstation somewhere. Is there a file i can delete on the local
machine in dos to reset this.
I have tried deleting system.dat and the user.dat files for all 3 domain
user accounts.

Thanks in advance
Chuck