Can't access shared drive

I have a notebook computer with Vista64, and my wife has a desktop with Vista32.. I have set two of her hard drives to 'share', and created myself an account on her computer that matches my account name on my notebook. When I go to explore the network, I can see her computer and hard drives, but can't access them.. It always says access denied.. I _CAN_ access the Public folder..

What do I need to do to share these drives?

Thanks

-Matthew