Network and Sharing is using Wireless adapter instead of ethernet

I will try and make this a simple as possible. I have 2 laptops. The first is running Windows 7 ultimate and the other, Ubuntu 12.04. They are connected via Ethernet through a Linksys BEFSR81 router. Both computers have static Ethernet addresses. I have a wireless router and both computers use their own wireless adapters for an internet connection. The wireless router (BEC 7800TN R2) is not physically connected to the eth router. The wireless adapters are set to use DHCP. IPv6 is disabled on the Ethernet adapters.

Here's my issue:

Streaming video or transferring files from the Win7 to my linux machine is very slow or fails unless i disable the wireless adapter on the Win7 laptop. However, if I change my wireless profile to public, which has sharing disabled, then no shares will show up in samba on the Linux 'puter, although I can ping the other computer by IP.

I have tried using lmhosts on both computers but to no avail. I can ping the Linux computer from my windows machine by IP, but if i try to ping from the NetBios name, it shows that its going through the router and will fail depending on whether the wireless profile is set to public or home.

How do I configure Windows so that the wireless is used for internet access only? Is this a router config issue? I'm racking my brain on this one.

EDIT: Even when file sharing/streaming is not working, Synergy still works fine and I can share the mouse/keyboard no problem.

Hello and welcome Banqu0 mate it might seem over simplistic but how about a USB to USB cable and cut out the wifi stuff when transferring that data?
Am no expert with this anyway but something I would try