Networking :: Banning Specific Operating Systems From Connecting To Home Routers ?

I might as well start off by saying that I have the Linux-based Linksys WRT54GL router running the Tomato firmware. I've come up with an idea that I'm not sure is possible. Specifically, setting a router up to ban not by the MAC address of the network card, but by the operating system the machine itself is running.

This way someone could have, say, a laptop dual-booting Windows and Linux and would be unable to access the internal network if they are in Windows. However, if they reboot into Linux (or practically any other OS) they would be able to access the local network safely without the chance of spreading worms and whatever else garbage across the internal network. Similarly, other devices like Xbox 360s, Wiis, etc. would be unaffected since they don't run Windows. [Yes, 360 probably runs some highly modified NT kernel, but almost nothing else is similar to a Windows PC and the whole system is highly locked down by Microsoft, so I'd say it could be an exception.]

I was thinking of specifically banning Windows XP and lower (honestly as f***ed up as I've seen Vista and 7 get, I would consider banning those too...). The idea is to allow, well... everything that isn't Windows (except possibly Win7) to connect wirelessly to the local network.

Unfortunately, I cannot do anything like this just yet, and I'm in the planning stages, trying to figure out if it is even possible. There are unfortunately two computers in the house that aren't mine (one running Windows XP and another Windows 7... go figure, they came with it and either my sister refuses to use anything else or my mom's computer's wireless is a massive PITA to get to work in anything *besides* Windows). My guess is that this is either not possible or would be extremely hard to pull off. What do you guys think?

On the other hand, it would probably be possible to connect two routers to the incoming cable connection, giving them both different settings (SSIDs, WPA passwords, etc.) and only giving Windows users access to the outer router, but it'd be cool to be able to accomplish something like this with one router through its settings.