If you go to the "Big Box Store" and tell them you want everything removed from the PC except for the Windows Operating System, their "Geeks" should be able to do exactly that before they deliver your new PC. If they won't do that, then you can simply go into the "uninstall, Add Remove Programs" menu and remove everything yourself, expect for the stuff that has the name "Microsoft" in front of it.
That will give you a clean PC without all of the extra stuff that gets installed with many of the commercial programs.
George