Problems with seeing computers on the network map but they are not able to connect with each other

Hi All,
We have 6 HP pavillion Slimline s3620f PCS(Pentium Dual COre ED200) with 10/100 and wireless connections.  They are running Windows Vista Home 64.  We are also trying to connect a macbook, a laptop with vista 32, and a a mac with win xp running via bootcamp.  We upgraded to the WRT160Nv2 for wireless access. 
We have the cable modem connected to the router.  The router is connected to a switch.  On the network map, all connections are working/green(can access internet).  Before this, in the vista network map each computer could connect to the other.  NOw each computer can only connect to the router and one particular other computer.  Each computer lists itself and that one particular other computer and the router.  If I look at the full map, all are listed but they cannot connect to each other. 
I hope this makes sense.  Any suggestions?
L

Your computer firewall is not recongnizing your router.
Greetings from Northern Ontario, Canada

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