Norton Internet Security 2009 and LAN access problem when I changed ip address

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Hi

 

I am using Norton Internet Security in the old office I have got no problem with shared files between 3 computers, and shared printers (USB printer not network printer), and pinging

 

I moved those 3 computers (XP SP3) from the old office to a new office, and  I changed the router from Netcom (10.0.0.1) to Linksys WAG54G2. ip addresses for computers changed from 10.0.0.x to subnet 192.168.1.x

 

Now all 3 computers are able to ping 192.168.1.1 (Linksys router ip address)

 

But those computers cannot ping each other

 

When I disabled 2009 Norton firewall (temporarily for 15 minute ), they were able to ping each other .

 

How can I fix this issue?

 

Thanks