If I read you correctly, you are having trouble accessing your network share by computer name and are now using the IP address of the machine? I would check your infrastructure's DNS/WINS configuration if you can't resolve your server's name.
Also, this forum is geared toward questions around the Network Access Protection (NAP) platform technologies. You might want to try your question in the Network Infrastructure Servers forum
http://social.technet.microsoft.com/Forums/en-US/winserverNIS/threads.