1.) download 2.) unzip with winrar 3.) put the "Max_Retopo.mse" file into any folder 4.) go to 3dsmax 5.) hit F11 (max script listener) 6.) go within that listener file > run script 7.) select that "Max_Retopo.mse" and hit open or run 8.) you should see the floater thats one way to do it
yup use retopo tools to build a new optimized mesh upon your bold one. Check out this free script to do so: http://www.scriptspot.com/3ds-max/max-retopo