Not able to see NAS

I have a NAS hard drive into a  DIR 615 dlink router I have 2 computers running XP home SP3  1 computer is wired the other is wireless. all computers can see the NAS  but my WD Live + cannot see it. The wd live + can see the wireless computer. It is also asking for a password ? I do skip that step that is when I can see the wireless puter.hope this is enough info to  generate some idea’s if you need some more info let me know

Looking for some ideas as to what direction to go. Thanking all in advance

Your NAS needs to be “shared” with a userid/password which you will use when you connect from the HUb or make sure no secirity is specified for the NAS folders.