Sid, this is a stupid question, but you did download the app for your computer (Amazon.com: Free Kindle Reading Apps
If so, a book should
download to your computer within a minute. I'd either ask this question on the Amazon Kindle discussion board or call Customer Service. Customer Service is very good for the Kindle!
CruzNut, once you buy a router there shouldn't be any extra charges. We have one since I use the "big" computer and DH uses a laptop across the room.