Dsl -> switch -> 3 computers & wireless router -> laptop -- problems seeing all 4 computers in "Network Neighborhood"

Hardware used

Cisco 675 DSL router
D-link 624 wireless router
D-link g650 wireless pcmcia card
linksys switch
3 desktop computers all running Win XP PRO
1 Toshiba Laptop running WIN XP Home

I have hooked this up too different ways

1st

DSL router feed the Wireless router. The wireless router feed the switch
and the laptop, the switch feed the 3 other desktop computers

All could access the internet, all had different internal IPs 192.x.x.x,
all the computers could see each other in "Microsoft Windows Network"
from within "Network Neighborhood", BUT all had the same external IP.

since two of the desktop computers run ftp servers, and reward programs
require you to have two differnt IP's if you have two different accounts
this solution would not work for me

So I hooked it up a different way

2nd and current

DSL feeds the switch. The switch feeds the 3 desktop computers and the
wireless router, the wireless router feeds nothing but the laptop.

now the 3 desktop computers have 10.x.x.x internal IPs and the laptop has
a 192.x.x.x internal IP.

All can access the internet, all have different external & internal IPs,
but the 3 desktop computers can not see the laptop in "Microsoft Windows
Network" from within "Network Neighborhood". Also the Laptop can not see
the 3 desktop computers.

How can I have all 4 computers get different external IPs, and all see
each other in "Microsoft Windows Network"


BTW
I tried turning off DHCP on the wireless router while hooked up in the
2nd configuration, and I could not get an internal IP at all on the
laptop