Networking problem

[androidz]

I have a problem with the way I setup my network... I can't view my workgroup'ed computer when on WiFi

Here's how my network setup appears...


(Internet)
|
[Modem]
|
[Switch]
+++
||+-[WiFi Router1]
|+- [Desktop1]
+-[Desktop2]

[Laptop1] Connected to WiFi Router1
[Laptop2] Connected to WiFi Router1

Laptop1 can see Laptop2 and vice-versa in Workgroup
Desktop1 can see Desktop2 and vice-versa in Workgroup
(Desktop1 + Desktop2) cannot see (Laptop1 + Laptop2) and vice-versa in Workgroup.

I figured it has something to do with the IP addresses. (dns subnet) and whatnot, thing is, I don't know how to set it up so that one network can see another.
Any help would be great and will be appreciated.

[Pallav]

is the subnet mask the same? also is the Router1 in "Router" mode instead of "Gateway" mode?