Woody doesn't come with a 2.6 kernel. You'll need sarge (Debian testing) for that!
You can install the latest CD image for sarge from http://www.debian.org/CD/http-ftp/#testing,
but it would be better if you installed jigdo and installed that way. Jigdo makes an iso file by collecting the various files that will be on the CD from any debian mirror in the world.