You cannot uninstall DirectX. You can update, or you can replace by formatting your hard drive. I have heard its possible to remove it without these measures, but its is a complicated process, and really there's no point. unless you intend to install another operating system on your PC, like Linux(Lee-nux).
Bodkin
vBulletin® v3.7.4, Copyright ©2000-2009, Jelsoft Enterprises Ltd.