If each room has ethernet, just go down to the basement and look for the ends of the cables or a "patch panel." Many home will just have the cables grouped together. They look like they have phone plugs (male connectors) on the end, but a bit wider with 6 pins instead of the 2 or 4 that phones have. These you will simply be able to plug into the LAN ports of the router. A patch panel has the female jacks instead; you plug an ethernet cable between each operating jack in the patch panel and the router.
Wireless has a lot of disadvantages versus wired, but could be used as a last resort. I don't know what equipment Comcrap provides but if they cheaped-out on you, you can get a 150N router for about $30. I recommend Dlink if you go this route, and whatever you do, stay away from Netgear products.
If you believe people should work till they die to pay for a government worker to retire at 50, you're a Democrat. Otherwise, you're a Republican. All other differences between the parties are trivial.