Windows system is a very open system, not in the sense that Microsoft shares its expertise and provides access to its code, but rather in the terms of its compatibility with other system. If you quietly use your computer at home without internet connection, there is no problem. But once you are permanently connected and visit lots of websites, it is risky. DHCP Fix can avoid several dangers if you belong to the second group. It closes vulnerable ports on your machine in Windows 95/98/2000 to avoid intrusions. It allows you to program the authorization to open or close these ports.