win2k Pro in NT domain

We have a stand alone server (own domain) in an NT network.I want to copy files from my win2k pro to it but I can’t. I can’t browse to my pc, but I can from my pc to the server, I can’t add users from that server because it doesn’t appear in the drop down list. I’m sure is something simple ,but, I’m missing it. Thanx for the help.