Client for Microsoft Networks shows up under "Properties" for the "Local Area Connection." In that dialogue box I routinely disable File & Printer sharing, and NetBIOS over TCP/IP under WINS, since this machine is not networked and connects to the Internet through a router. I also disable the related Windows services. I really do not know anything about Client for Microsoft Networks, but Googling it seems to bring up info that would indicate it is probably not needed in this set-up, and turning it off would not only conserve resources, but actually might enhance security. Any reason not to kill it?