Can you net view the server? if net view \\servername receives system error 53, this may be name resolutino issue, if 5, it may be the permission issue?
this page may help,
http://howtonetworking.com/Troubleshooting/notaccessibale0.htm
Don't send e-mail or reply to me except you need consulting services. Posting on MS newsgroup will benefit all readers and you may get more help.
Bob Lin, MS-MVP, MCSE & CNE
How to Setup Windows, Network, Remote Access on
http://www.HowToNetworking.com
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
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I recommend Brinkster for web hosting!
I have a small network of 8 computers.One of the machine can ping others but
it cannot access server hard disk.