Now I'm confused, do you have TWO processors, I mean 2 processors as in a mainboard with TWO sockets (i.e. Intel XEON, AMD OPTERON) and windows home? Windows 7 home PREMIUM supports TWO processors (each with as many cores as it has, 16 or something being the maximum). Anything below home premium only supports one CPU (with as many cores as you want). But I doubt anyone will use anything less than the home premium edition anyway. Especially when you have dual-CPUs.