Windows File Sharing Problem

[Serj]

Ok, first up, here's a diagram to explain my current network set-up, hopefully it will make it a little clearer what I'm talking about :)

Hooray for paint!

The problem I'm having is with windows file sharing. The two PCs connected via the wired network can see each other just fine, and file sharing is not a problem.

However I cannot see any of the workgroup computers from the laptop, which is connected to the network wirelessly via the wireless router.

I can ping both the wired router and the PCs from the laptop, but trying to ping the laptop from the PC times out.

Its probably worth pointing out that the laptop can connect to the internet with no problems at all.

PC 1 : Windows XP SP 2

PC 2 : Windows Vista Ultimate

Laptop : Windows XP SP 2

All the computers are added to the "WORKGROUP" workgroup.

Summary of Network

American Robotics Sure Connect Modem Router: IP 192.168.1.1

- PC 1 : IP 192.168.1.XX

- PC 2 : IP 192.168.1.9 (static)

- Xbox : IP 192.168.1.6 (static)

- Buffalo Airstation Wireless G Router: IP 192.168.11.1

--- Laptop : IP 192.168.11.9

--- Nintendo DS

---Nintendo Wii

I doubt its relevant but the wireless network is WEP128 encrypted.

Any help is appreciated, thanks :)