Hi Bringe. You will be able to retrieve your documents however there is a path to follow when you hook up your old drive. I'm sure you will know what to do, but just in case....
1. Place the hdd from the defective pc in your new caddy/enclosure.
2. Plug the caddy into a USB port on any healthy computer.
3. You may get an auto run box up on the screen...If not, go to computer/My computer and open the drive from there.
Here's an image of what you are likely to see:
http://i153.photobucket.com/albums/s210/DSTM_photos/Examplee.jpg
As you can see from the image, there is a list of folders. The one you are interested in will be "Users". Open that folder to find your user name, and then in turn your personal images, documents, files, etc.
Hope this helps out.