Belarc Advisor - Complete PC Inventory

"The Belarc Advisor builds a detailed profile of your installed software and hardware, missing Microsoft hotfixes, anti-virus status, CIS (Center for Internet Security) benchmarks, and displays the results in your Web browser. All of your PC profile information is kept private on your PC and is not sent to any web server."

The Belarc Advisor is free for personal use. It produces a report listing every component of the computer and can list the serial numbers used when many programs were installed.