Hi,
I think I need more information. Can you provide actual error message/screen shot or exact wording?
Do you have a domain (Active Directory)?
Are your clients DHCP enabled or static IP configured?
Does name resolution work? ping the domain by name - ping the share host by name?
Are the old a new computers using the same version of windows? What version of OS is the share host?
Is the share NFS or SMB?
etc.