you can try right clock properties on the app run in 32 bit mode. most propably it wont work god knows why they have this option. your best fit is to download XP for windows 7 it will act like a VM on your windows 7 and you can install all your 32 bit apps and stuff.
you can download XP mode for windows 7 in microsoft website.
if you find that all too complicated you can try installing vmware and have a virtual session to run those apps.
if also its too heavy on your system or too complicated you can download oracle OVM to create that virtual session.
hope that helped.