I am experiencing a significant slowdown when sharing files over a home
network. Here is the scenerio:

4 computers: 3 have Vista sp2, 1 has XP sp3

1 of the Vista computers is set up to share documents via the public folder.
All computers are running Norton Internet Security 2009.

When the XP computer accesses shared files on the Vista computer, there are
no problems. But when using 1 of the 2 remaining Vista computers to access
the shared files on the Vista computer, there is a significant slowdown. It
takes a long time for the file to open. From what I can tell, Norton is doing
a full scan on the shared file before it "downloads" it.

If I disable Norton autoprotect the problem goes away, but obviously this
isn't the way to fix the problem.

I recognize this is probably an issue with Norton, or at least the way
Norton is interacting with Vista, but I have no idea how to fix it, other
than removing Norton and using another virus software. Contacting Norton has
gotten me nowhere.

All computers have the latest MS updates. I have tried uninstalling and
reinstalling Norton, with no success.

Is there a way to fix this problem, or is it just a function of Norton and
Vista interacting poorly? Just to be clear, there are no issues when
accessing the internet via the same shared router. I also just added a Window
7 computer to the network, with Norton 2010, and the same problem occurs (the
file eventually opens after a long lag/once scanning completes).

Thank you.