Computer A has a Windows firewall and B does not. I disabled A's Windows firewall and still B could not ping A. Is it possible that the Norton software (s/w) has installed its own firewall? How do I determine if there's another firewall besides Windows Firewall?
Can you think of any other reasons why, suddenly, after I installed a new modem/router, that previously shared document folders on Computer A cannot be accessed by Computer B?
Let's start with Windows issues. One good article that might help is on Microsoft's support page: How to troubleshoot network in Windows XP. You will also want to check your TCP/IP settings to make sure IP, netmask, and default gateways are all correct.
If those are correct, check to see if you can you ping by IP and/or computer name. Also, check to see of you can see the other computer in Network Neighborhood. If everything looks right here, check the firewall settings.
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