if i up-grage a computer to say dx8.1 and some1 else come behind me and loads a game that installs dx6 what do i do to fix the problems that made. there is no uninstall for dx. should i reinstall dx8.1 or do a regedit and remove it that way and then reinstall it. that is the problem with people that think they know what they are doing with computers. help please.