I am not an admin to these boards, so I am not going to give you a lecture in a hrash way like an admin will probably do when they close this thread, but please search next time. Shaders has been out since 3.0, and ever since, there has been someone people having problems with it. About the only way your going to be able to run shaders if it is not running now is get a better graphics card.
Also, this is more of a support thread, so it wouldn't even go here. Just for further reference.