Then mearly typing the instructions Nums indicates should fix your issue. Let us know if it does not.
I bet Vista does not actually ship with the files, that it was the DB 2.1 installer that laid them down - it works fine on XP - but that there's some sort of Vista security thing that prevents the DB 2.1 installer from registerring them. Your probably not running as a local admin or eqivalent. There was a lot of work done in Vista to let users run at reduced privledges....