My solution
I personally solved the problem by eliminating every scintilla of security from the SNAP server so that no login is required. However, there is another solution posted under Windows Vista Forums Windows Vista Support. Look for the thread initiated by Erik Hamzy. The replies and comments are spread over three pages. Toward the end of the sequence there are some instructions on how to modify the basic network security parameters of your machine. I tried to do that and found I did not have the version of Vista to which they were referring. I then recieved modified instructions which I was able to implement.
cheers,
ray z