As of a couple of months ago none of my Windows 7 Machines can browse network shares on our 2003 servers.
I have network connectivity (internet is fine, I can ping the servers both by Name and IP, NSLookup is fine, etc.) AND I can browse the Win7 shares from 2003 and even XP....? Strange. Similarly, The XP machines have no problem with the 2003 shares
Having done the Win7 research in advance I made sure to set the appropriate NTLM Local Policys on the Win7 PCs and that worked like a charm. Naturally, when the shares became ghosts, I checked that they were still set correctly in case an update reverted to the default and I had been caught off guard. Yup, all good.
I can't believe this is so difficult to figure out.
My set up is:
Win2003 DCs and servers
Win2008 Core File server (not yet configured)
AV is Symantec Endpoint Protection v11.0.5 and current (which I will uninstall once I get an install package created and copied over to a Win7 PCs for reinstall)