What are you exactly trying to do? You make no sense.
First, most games on this site are already preinstalled. You don't need to reinstall them.
Second, if you want to play almost any DOS games with a modern OS like XP, for example, you'll need to use either
VDMSound or (even better) DOSBox.
Third, if you are using the dreaded VISTA 64 bits then you have no compatibility whatsoever with old Win 16 bits programs. This mean that you are screwed, as far as I am concerned.