I run a wireless network WPA/TKIP.
My router is a Billion 7402G (it's getting old).
I have a Macbook Pro that I use daily for work and is more or less constantly connected.
The router is located in the living room, my office is downstairs and to the right of the router, I have excellent signal strength in the office.
Whenever a Windows machine (Windows 7 or Vista, not sure about XP) joins the network my Macbook loses connectivity to the outside world. I have no internal shares so am not certain whether it remains on the network. If I turn Airport off, then back on again, it can see the network but cannot join it, unless I walk upstairs physically closer to the router, where it begins to work again.
Once the Windows machine is off, everything works again.
The router is set to DHCP however all machines in the home are assigned IP based on MAC address, I was hoping that would resolve the issue but seemingly has failed to do so.
This occurs with my Windows 7 laptop (IP assigned via MAC address) and any guest's Windows laptop that are full DHCP.
Why does a Windows machine connecting to the network result in my Macbook losing connectivity?