SIW is a free Windows tool (there is commercial version as well) that gathers detailed information about your system and displays it in a comprehensible manner. Information includes software inventory (OS, installed software and hotfixes, processes, services, users, open files, etc.), hardware inventory (motherboard, CPU, all kinds of sensors, BIOS, chipset, devices, S.M.A.R.T., etc.), network onformation(NICs, shares, etc.), and some nice tools. On top of this, it is a standalone utility that does not require installation.