Swapping files in network?

Use a router to get internet to both and share files.
Use a switch if you just want to share files and not use the internet.
The router will have a firewall built-in to protect your computers though.

No, he said router for both (reread his post if you want), switch for just sharing.

Mike.

You have the hardware in place, as the OP fairly clearly states, just setup file sharing and off you go. The easiest suggestion for you is to just google windows file sharing tutorial, throwing in your Particular OS. For example XP Home File sharing tutorial in a google query provides about 2 million hits. The first page of links really should be all you need. practicallynetworked.com homenhelp.com ezlan.com all have very descriptive articles. Then if you have specific questions this would be a decent place to ask them. As it is, your question is far too generic and provides too little information to go on. Even if you post your system specs down to the mobo chipset, a webpage dedicated to answer this very question (hundreds of webpages actually) is going to be your best bet. Step by step, illustrations and so on. I am sure many people could walk you through. My point is, all the information is out there, already nicely typed, organized and illustrated.