Password list maintenance

Hi all. Our school has a network of 70 or so Win98SE computers connected to a couple of NT 4.0 servers. We have about 250 users. Several of our students often forget their password, and when I change it on the server I must then track down their password lists and delete them from the various computers. (ie, delete the jdoe.pwl file from C:\Windows)

My question: is there a way to keep Windows from creating a password list? I don’t figure we really need one except on admin machines using passworded screensavers.

Or, is there an easier way to go about this? I thought about a batch file erasing password lists, but the problem there is the kids keep having to enter passwords repeatedly with each login.