Hello
I guess that's the fastest thing to do, you turn off the index, and turn off also indexing in the other computer.
Windows Vista has many discussions about slow on Networking.
That's why Vista was replaced by Windows 7
Try to go in Ms Word/Excel, Tools Menu, Options, General, uncheck [Update automatic links at Open]
My advice, use Windows XP (if re-installation may occur)
Great is our GOD.
:)
rionroc