yes its just that ,64bit is the way everything is going now .but many people have programs that are 32bit only and will only work in a 32bit environment ,If you go into (my computer) and click on your main drive you will see (in a 64bit machine) 2 program files folders .
adobe photoshop will install a version for each as well .
in the next year or so you will see a lot of the 32bit stuff dissappearing for good . by the next operating system release almost everything will be 64bit . and soon after 32bit will be gone forever.