XP can no longer map to Win7

User has a 2-user LAN with simple file sharing.  For years he has been able to map a share drive letter from the XP machine to the Win7 machine, and vice versa.  The share from XP to Win7 has suddenly stopped working, and I need guidance on what to try.

The share from Win7 to XP still works fine.

They recently bought a simple Netgear router from Staples after theirs died.  Both PCs are once again connected to the internet.

Things I have tried:

1) Temporarily removed an old, expired copy of Norton internet security on the Win7 PC, in case that was blocking it.

2) From the XP computer, I have tried to ping the Win7 PC and that timed out.

3) If I try to map a drive with the Net Use command from the command prompt, I get an error 53, path not found.  I tried the usual Net Use F: \\ginscale\c and Net Use F: \\192.168.1.2\c, and got the same error.

4) On the XP computer, if I try to view network computers, it never shows the Win7 PC--only the XP unit.  They are in the same workgroup, and the router has assigned IP addresses in the same range.

5) On the Win7 PC, I have verified that nothing changed about the share name, and that the XP computer name and password is still set up as a user on Win7 PC.

Any ideas what else to try, and what might be going on?  Again, it worked fine until they replaced their router--or maybe that was a coincidence.  TIA
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sasllcAsked:
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Miguel Angel Perez MuñozCommented:
Have you checked firewall on both computers?
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sasllcAuthor Commented:
Yes, on the Win7 PC I temporarily removed the Norton internet security completely and rebooted, and I also tried shutting down its windows firewall.  Meanwhile, on the XP machine I temporarily turned off the firewall and antivirus protection in its Norton 360 program.
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Miguel Angel Perez MuñozCommented:
Could you check if server and workstation service is running on both computers? also, could you paste tcp/ip configuration of both machines?
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Rob MinersCommented:
Also check that the Computers times are in sync
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Pramod UbheCommented:
just to make sure it is something on router side, can you check by connecting both the computers with a cross cable? if not can you try mapping with IP address? Also check the ports 445 and 139 are working by telnet command
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kabilanisCommented:
Please check if IPv6 is creating this problem in the Win 7 computer
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sasllcAuthor Commented:
I never could get anything to work, so I tried a system restore on the Win7 PC, and that solved the problem.  Why, I don't know.
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Rob MinersCommented:
Thanks for the feedback, I'll keep that information for future reference. :)
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