If you mean every scrap or bit then you want to explore the rather expensive clean install of the OS.
Most of us will be happy with this one -> http://www.pcdecrapifier.com/
It may find more for you to remove.
Another one to run that I like to clean it all out on a new box is http://www.ccleaner.com/
Hope you find this useful,
My Dell computer (w/Vista) came preloaded with some junk (such as free trials for Earthlink, etc.). How do I get rid of stuff like this? If I just go to "remove program", I know there are still pieces of it left. I want to get rid of all signs of unwanted programs.