Business office network

I'm hoping someone can help me with this issue.

I have a small network in an office.  I can connect to the internet via supplied router from both computers.  I can communicate (Map a drive / Ping) from System A to System B but cannot communicate (map drive/ping/etc...) from System B to system A.  

I can use external apps such as Teamviewer over the internet to see both machines so I'm positive this is an internal network issue with 1 of the systems.  

The systems are connected to the network through the phones.  Then the phones plug into ports on the back of the Cisco router.

I have the model number for the router but forgot to bring the paper with me today.  

The IP address are issued via DHCP and there are DNS settings for the default and secondary gateways.  Removing the gateway settings still enable me to connect to the internet with no problem.

I'm thinking this is a routing issue but would like some other options as to how I can troubleshoot this problem.

These are WinXP systems.  What other info can I supply to help with the troubleshooting?

Thanks for the help.
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RPPreacherConnect With a Mentor Commented:
Turn off the Windows firewall on system A.

How to disable Windows firewall
James HIT DirectorCommented:
Can you post ipconfig/all of both PC's?
This will help up get started.
James HConnect With a Mentor IT DirectorCommented:
Do you have the Windows firewall enabled? Can you disable and see if ping works?
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Hey.  There's an echo in here.
ParaleptropyAuthor Commented:
I will post the IP Config info from both machines as soon as I'm able to.

Both machines are using Sunbelt Vipre antivirus with Firewall.  I'll disable it on the System A to see if that's the issue.

I'll post the results later.

Thank You.
ParaleptropyAuthor Commented:
Yah know...  I was looking at the firewall and thought...  Nah...  why would this just start to fail.  The guy told me the network went down on Saturday and I didn't even put this together.  Just so happens that the IP address changed and the firewall was set to allow connections from certain IP Address's.

So, thank you for your help.  I split the points up between the two of you giving the majority to first person to mention firewall.
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