"Get the best of both Linux and Windows worlds
Although you certainly can use the Internet safely on a Windows PC, doing so requires a lot of effort these days just to ensure that your copy is properly patched and secured. Like it or not, Windows has become the Ford Pinto of operating systems.
Painless way to add Ubuntu to your Windows PC
You can install OS X on your PC, but doing so is neither easy nor permitted by Apple's license, which requires all installations to be on Apple hardware. There are hundreds of free Linux distributions, however, that will work. Canonical's Ubuntu 8.10 — code-named Intrepid Ibex — is arguably the easiest Linux distro for Windows users to install, configure, and use.
In addition to the major revamps that appear each year in April and October, Ubuntu receives updates and patches almost daily. The free OS also comes with an enormous library of free, downloadable applications and utilities.
Installing most Linux distributions requires you to download and burn to a CD a several-hundred-megabyte .iso file and then boot your PC from that disc. Ubuntu supports this installation method, but it also provides an alternative, brain-dead-
easy approach: Wubi, a free Ubuntu installer that works entirely within Windows.
Rather than repartition your disks, Wubi downloads and installs Ubuntu's files to a virtual disk stored on your existing Windows partition. Wubi's download is still a daunting 700MB, which can take a while if you lack a fast connection. (Of course, you can keep using your other Windows programs while Wubi does its thing in the background.)"
http://WindowsSecrets.com/comp/090108