I'm running windows 7 and just installed CS6 64 bit. I understand 64 bit doesn't use TWAIN and must instead go by way of WID. Problem is getting that set up. Very little helpful information other than being told to un-install and re-install in 32 bit. Come on, really? With all the technology behind this program that is the answer?
Not sure what you're asking. If your drivers don't support WIA or Windows' generic drivers don't handle your scanner, then this is completely outside Adobe's sphere of influence. You simply install your hardware vendors's driver (or let Windows search for it automatically) and either it works or it doesn't.
Moving this topic to the Photoshop General Discussion forum.