ot w98 password delete

Hi everyone. Anyone know how to delete the windoze passwords that one can log onto the 7.3 Samba network and start again? Like the bit where it says 'you have never logged onto this computer before please type your password again', with the same password? Seems to be an important and undocumented one in being able to drop files from the Linux server to the clients. Please be specific if you can. We are not used to w98. BTW, why don't linux clients have to type their password again? Thanks, Steve.