They cost around $25 and you can buy them in most stores that sell computers. Be sure to get the right size (2.5" or 3.5" and type (IDE or SATA). Put the drive in the enclosure and plug it into a USB slot. Windows will recognize it and assign it a drive letter where you can access it with Computer (aka Windows Explorer).
My parents had an old dell computer that was super slow, so they got a new HP. They wanted to keep the old HD because of the pictures & documents.
So my question is how can I go about hooking up thier old HD for them to get what they need off it and transfer the documents and pictures.