Patch installation control is described, including evaluating a system registry for a system identification, determining an installation case based on the system identification, and installing a patch if the installation case indicates a first result. A system for controlling patch installation is also described, including a registry configured to store configuration data including a system identification and a patch installer configured to determine an installation case based on the system identification and install a patch if the installation case indicates a first result. A computer program product for controlling patch installation, the computer program product being embodied in a computer readable medium and comprising computer instructions for evaluating a system registry for a system identification, determining an installation case based on the system identification, and installing a patch if the installation case indicates a first result.