Free Personal PC Audit.
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.
Belarc Advisor is free for personal use only.
For Windows 95/98/Me, NT 4, Windows 2000, XP and Windows Server 2003.