Cannot see anything in network map win 7 64 bit

Hi,
I have a win 7 64 bit install and when I look at network map nothing is seen "response late or incompatable router"
Netgear router go to diagnostics can ping an XP machine
set up is
netgear router DG834GT
netgear gigabit switch GS608 v3
netgear powerline XAVB1004 to Smart tv, blue ray and pvr
netgear xav2001 to xp pc

router can ping all devices 192.168.0.2 to .7
I have Kaspersky Internet Security

Conection
Internet to router and win 7 PC
Router linked to switch

Have disabled kaspersky still ping request times out

thanks

UPDATE
found 2 network ports on PC
1 Nvidia
2 marvel
switched to 2 and ping now working, still no map though

If you're trying to see XP machines on a network map, you need to install the Link Layer Topology Discovery (LLTD) Responder


http://www.microsoft.com/download/en/details.aspx?id=5577

This is a networking protocol that is pre-installed on Vista and 7 machines that allows the network map to be created