W2000 clients

Hi We have a network of over 200 windows clients (95 & 98) which login using Samba to a Linux server based on Suse 8.1. We may need to add W2000 clients but we can't seem to get the same login structure working. Are there any issues using W2000 clients with a Samba server. NB we do not use encrypted passwords and they have been disabled on all the different clients. Dave Williams