Zero Config MFC Application, part of Intel's ProSET utilities and installed by the drivers for many of Intel wireless network cards - essential to the proper functioning of many of the Intel ProSET utilities (but not all) and these System Tray ProSET utilities are a must if you are using your wireless connection, if only so you know when the signal is fading or dropping. The problem is that, in some PCs, ZCFGSVC can be incredibly badly behaved : taking up to 100% of CPU time and therefore resulting in an extremely slow PC, preventing the installation of software or Windows updates, or causing "Not Responding" or "End this Program" shutdown problems. If you experience this, try first the very latest drivers from Intel or your laptop manufacturer. If that still does not solve the problem and you have WinXP/2003, try setting the "Wireless Zero Configuration" service to disabled