Reason number one: Linux is boring. When I run Linux, I don't have the excitement of wondering whether an e-mail, IM, or Web page is going to give my system the latest worm or virus. Where's the fun in that?
Reason number two: Linux is a pain to set up. With Linux, you need to put in a CD or DVD, hit the enter button, give your computer a name, and enter a password for the administrator account.
Reason number three: Linux is expensive. Linux is often free, but look at all that time you spend setting it up. Most people will end up buying new PCs with Vista preinstalled.
Reason number four: Linux doesn't have enough apps. Most Linux systems come only with secure Web browsers, like Firefox 2.0; e-mail clients, like Evolution 2.6 and Thunderbird 2.0; IM clients, like Gaim 1.5; office suites, like OpenOffice.org 2.0.4; and so on. .....
You can read the entire "story" here..
http://www.pcmag.com/article2/0,1895,2074985,00.asp