usually you goto the hardware wizard and run the new hardware part , then when it finds your printer and asks for a driver you manaully point to it via the browse function (in the files you downloaded , thats what those files you downloaded are for , there should be instructions on the download site)
look for other versions of the same driver that end in .exe in the filename of the download
it maybe however that the printer utility isnt supported in Vista so you only have the printer drivers to install , that could be why thats the only download availabe
if it is and your stuck , come back and we can talk you through the process , its easy
