Ok, here's the setup: I live in a house with 4 floors, the top 2 floors share a cable connection through an 8 port router and the bottom 2 floors share a separate cable connection through an 8 port router. I was trying to figure out a way to network the entire house, but keep our internet connections separate. Any ideas on how this could be done?

Both routers are 8 port Linksys BEFSR81

I already tried running a cable from each router into a hub and it worked!......kinda. it networked everyone, but for some reason it also made all 4 floors share the upstairs internet connection and that won't work. Any ideas or suggestions would be greatly appreciated.

Bridges are designed to network 2 LAN segments. I'm not sure why your whole network was using that one connection. Probably one router took over all the DHCP addressing. The bridge may stop that practice.

You had the right idea, run a cable from each router to a hub, or directly into each other. The problem you ran into is a dhcp server conflict. You have both routers giving out IP addresses, the computers will take the first address they are offered which happens to be by the router upstairs, so that is why they are using it as the link onto the internet.

Solution:

Disable DHCP on both routers, set router1's ip address to 192.168.1.1 , set router2's ip address to 192.168.1.2 , subnet masks to 255.255.255.0 on both, give all systems on your network a static ip address. 192.168.1.3, 1.4, 1.5 etc. all with the subnet mask of 255.255.255.0, then set the default gateway on each system to the router in which you want to connect to the internet from computers upstairs will use 1.1 and downstairs 1.2. Set the dns to the same ip as well (if you have problems connecting to websites by name, try changing the dns to those provided by your isp)