Have you Ever Connect your Wifes computer to a shared folder on your Computer Before , if not you may not have file sharing fully enabled on both computers
on you wife comp go to the run box in the start menu and type
\\Yourcomptername\
Then it should connect to your computer and it may ask for your user name and password , put them in and click OK, you should then see all the shared files on the computer, or it will give you an Error or just not work
if it doesn't work you need to fix the File sharing settings on the Computers