Non Admins not able to login

Hello everyone,
I'm having a strange issue where non admin domain accounts are not able to
log into Vista Business systems. These accounts all work fine in XP and they
work if I make them local admins on the Vista laptops. The error I get is:

"You cannot log on because the logon method you are using is not allowed on
this computer. Please see you network administrator for more details."

I had this issue with a Dell systems right out of the box the other day and
once I reinstalled windows it worked correctly. Reinstalling is not going to
be an option for the systems I have the problem with now.


I have tried making local user accounts and they also produce the same error.

Any idea how to correct this issue would be greatly appreciated.
Thanks,
Ken