This problem is driving me insane, just when I think I have fixed the problem it comes along again. One particular student is always being asked for the windows login, how can this be? Other students in the same OU set up in the same way can get on a particular machine but she can't. I thought it was something to do with the zenpol32.dll but even that seems to be ok now (not getting overwritten). Someone else said they need to be admins on the PC with XP Pro, has anyone managed to get over this problem?